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RESERVE FOR LOSSES AND LOSS EXPENSES - Incurred claims and allocated claim adjustment expenses, net of reinsurance (Details) $ in Thousands | Dec. 31, 2017 USD ($) claim | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($) | Dec. 31, 2013 USD ($) | Dec. 31, 2012 USD ($) | Dec. 31, 2011 USD ($) | Dec. 31, 2010 USD ($) | Dec. 31, 2009 USD ($) | Dec. 31, 2008 USD ($)
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Aviabel |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Net claim and allocated claim adjustment expense reserves at the Acquisition Date | $ 68,371 |  |  |  |  |  |  |  |  |
Net incurred claims and allocated claim adjustment expenses from the Acquisition Date to December 31, 2017 | 25,237 |  |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | 93,608 |  |  |  |  |  |  |  |  |
Aviabel | Accident Year 2008 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Net claim and allocated claim adjustment expense reserves at the Acquisition Date | 998 |  |  |  |  |  |  |  |  |
Net incurred claims and allocated claim adjustment expenses from the Acquisition Date to December 31, 2017 | (293) |  |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | 705 |  |  |  |  |  |  |  |  |
Total of Incurred-But-Not-Reported Liabilities Plus Expected Development on Reported Claims | $ 30 |  |  |  |  |  |  |  |  |
Cumulative Number of Reported Claims | claim | 1,066 |  |  |  |  |  |  |  |  |
Aviabel | Accident Year 2009 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Net claim and allocated claim adjustment expense reserves at the Acquisition Date | $ 842 |  |  |  |  |  |  |  |  |
Net incurred claims and allocated claim adjustment expenses from the Acquisition Date to December 31, 2017 | 82 |  |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | 924 |  |  |  |  |  |  |  |  |
Total of Incurred-But-Not-Reported Liabilities Plus Expected Development on Reported Claims | $ 25 |  |  |  |  |  |  |  |  |
Cumulative Number of Reported Claims | claim | 1,347 |  |  |  |  |  |  |  |  |
Aviabel | Accident Year 2010 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Net claim and allocated claim adjustment expense reserves at the Acquisition Date | $ 1,516 |  |  |  |  |  |  |  |  |
Net incurred claims and allocated claim adjustment expenses from the Acquisition Date to December 31, 2017 | (39) |  |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | 1,477 |  |  |  |  |  |  |  |  |
Total of Incurred-But-Not-Reported Liabilities Plus Expected Development on Reported Claims | $ 46 |  |  |  |  |  |  |  |  |
Cumulative Number of Reported Claims | claim | 1,452 |  |  |  |  |  |  |  |  |
Aviabel | Accident Year 2011 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Net claim and allocated claim adjustment expense reserves at the Acquisition Date | $ 1,418 |  |  |  |  |  |  |  |  |
Net incurred claims and allocated claim adjustment expenses from the Acquisition Date to December 31, 2017 | (423) |  |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | 995 |  |  |  |  |  |  |  |  |
Total of Incurred-But-Not-Reported Liabilities Plus Expected Development on Reported Claims | $ 43 |  |  |  |  |  |  |  |  |
Cumulative Number of Reported Claims | claim | 1,420 |  |  |  |  |  |  |  |  |
Aviabel | Accident Year 2012 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Net claim and allocated claim adjustment expense reserves at the Acquisition Date | $ 5,248 |  |  |  |  |  |  |  |  |
Net incurred claims and allocated claim adjustment expenses from the Acquisition Date to December 31, 2017 | (1,066) |  |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | 4,183 |  |  |  |  |  |  |  |  |
Total of Incurred-But-Not-Reported Liabilities Plus Expected Development on Reported Claims | $ 177 |  |  |  |  |  |  |  |  |
Cumulative Number of Reported Claims | claim | 1,380 |  |  |  |  |  |  |  |  |
Aviabel | Accident Year 2013 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Net claim and allocated claim adjustment expense reserves at the Acquisition Date | $ 5,702 |  |  |  |  |  |  |  |  |
Net incurred claims and allocated claim adjustment expenses from the Acquisition Date to December 31, 2017 | 956 |  |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | 6,658 |  |  |  |  |  |  |  |  |
Total of Incurred-But-Not-Reported Liabilities Plus Expected Development on Reported Claims | $ 200 |  |  |  |  |  |  |  |  |
Cumulative Number of Reported Claims | claim | 1,286 |  |  |  |  |  |  |  |  |
Aviabel | Accident Year 2014 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Net claim and allocated claim adjustment expense reserves at the Acquisition Date | $ 10,589 |  |  |  |  |  |  |  |  |
Net incurred claims and allocated claim adjustment expenses from the Acquisition Date to December 31, 2017 | (1,636) |  |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | 8,953 |  |  |  |  |  |  |  |  |
Total of Incurred-But-Not-Reported Liabilities Plus Expected Development on Reported Claims | $ 804 |  |  |  |  |  |  |  |  |
Cumulative Number of Reported Claims | claim | 1,373 |  |  |  |  |  |  |  |  |
Aviabel | Accident Year 2015 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Net claim and allocated claim adjustment expense reserves at the Acquisition Date | $ 15,004 |  |  |  |  |  |  |  |  |
Net incurred claims and allocated claim adjustment expenses from the Acquisition Date to December 31, 2017 | (1,575) |  |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | 13,429 |  |  |  |  |  |  |  |  |
Total of Incurred-But-Not-Reported Liabilities Plus Expected Development on Reported Claims | $ 1,650 |  |  |  |  |  |  |  |  |
Cumulative Number of Reported Claims | claim | 1,475 |  |  |  |  |  |  |  |  |
Aviabel | Accident Year 2016 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Net claim and allocated claim adjustment expense reserves at the Acquisition Date | $ 19,388 |  |  |  |  |  |  |  |  |
Net incurred claims and allocated claim adjustment expenses from the Acquisition Date to December 31, 2017 | 2,134 |  |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | 21,522 |  |  |  |  |  |  |  |  |
Total of Incurred-But-Not-Reported Liabilities Plus Expected Development on Reported Claims | $ 4,278 |  |  |  |  |  |  |  |  |
Cumulative Number of Reported Claims | claim | 1,535 |  |  |  |  |  |  |  |  |
Aviabel | Accident Year 2017 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Net claim and allocated claim adjustment expense reserves at the Acquisition Date | $ 7,666 |  |  |  |  |  |  |  |  |
Net incurred claims and allocated claim adjustment expenses from the Acquisition Date to December 31, 2017 | 27,096 |  |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | 34,762 |  |  |  |  |  |  |  |  |
Total of Incurred-But-Not-Reported Liabilities Plus Expected Development on Reported Claims | $ 7,180 |  |  |  |  |  |  |  |  |
Cumulative Number of Reported Claims | claim | 1,114 |  |  |  |  |  |  |  |  |
Novae |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Net claim and allocated claim adjustment expense reserves at the Acquisition Date | $ 1,202,130 |  |  |  |  |  |  |  |  |
Net incurred claims and allocated claim adjustment expenses from the Acquisition Date to December 31, 2017 | 135,493 |  |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | 1,337,624 |  |  |  |  |  |  |  |  |
Novae | Accident Year 2008 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Net claim and allocated claim adjustment expense reserves at the Acquisition Date | 20,515 |  |  |  |  |  |  |  |  |
Net incurred claims and allocated claim adjustment expenses from the Acquisition Date to December 31, 2017 | 0 |  |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | 20,515 |  |  |  |  |  |  |  |  |
Total of Incurred-But-Not-Reported Liabilities Plus Expected Development on Reported Claims | 3,552 |  |  |  |  |  |  |  |  |
Novae | Accident Year 2009 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Net claim and allocated claim adjustment expense reserves at the Acquisition Date | 25,486 |  |  |  |  |  |  |  |  |
Net incurred claims and allocated claim adjustment expenses from the Acquisition Date to December 31, 2017 | 0 |  |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | 25,486 |  |  |  |  |  |  |  |  |
Total of Incurred-But-Not-Reported Liabilities Plus Expected Development on Reported Claims | 714 |  |  |  |  |  |  |  |  |
Novae | Accident Year 2010 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Net claim and allocated claim adjustment expense reserves at the Acquisition Date | 23,308 |  |  |  |  |  |  |  |  |
Net incurred claims and allocated claim adjustment expenses from the Acquisition Date to December 31, 2017 | 0 |  |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | 23,308 |  |  |  |  |  |  |  |  |
Total of Incurred-But-Not-Reported Liabilities Plus Expected Development on Reported Claims | 2,781 |  |  |  |  |  |  |  |  |
Novae | Accident Year 2011 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Net claim and allocated claim adjustment expense reserves at the Acquisition Date | 59,648 |  |  |  |  |  |  |  |  |
Net incurred claims and allocated claim adjustment expenses from the Acquisition Date to December 31, 2017 | 0 |  |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | 59,648 |  |  |  |  |  |  |  |  |
Total of Incurred-But-Not-Reported Liabilities Plus Expected Development on Reported Claims | 11,204 |  |  |  |  |  |  |  |  |
Novae | Accident Year 2012 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Net claim and allocated claim adjustment expense reserves at the Acquisition Date | 87,292 |  |  |  |  |  |  |  |  |
Net incurred claims and allocated claim adjustment expenses from the Acquisition Date to December 31, 2017 | 0 |  |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | 87,292 |  |  |  |  |  |  |  |  |
Total of Incurred-But-Not-Reported Liabilities Plus Expected Development on Reported Claims | 8,695 |  |  |  |  |  |  |  |  |
Novae | Accident Year 2013 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Net claim and allocated claim adjustment expense reserves at the Acquisition Date | 76,786 |  |  |  |  |  |  |  |  |
Net incurred claims and allocated claim adjustment expenses from the Acquisition Date to December 31, 2017 | 0 |  |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | 76,786 |  |  |  |  |  |  |  |  |
Total of Incurred-But-Not-Reported Liabilities Plus Expected Development on Reported Claims | 12,504 |  |  |  |  |  |  |  |  |
Novae | Accident Year 2014 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Net claim and allocated claim adjustment expense reserves at the Acquisition Date | 123,955 |  |  |  |  |  |  |  |  |
Net incurred claims and allocated claim adjustment expenses from the Acquisition Date to December 31, 2017 | 0 |  |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | 123,955 |  |  |  |  |  |  |  |  |
Total of Incurred-But-Not-Reported Liabilities Plus Expected Development on Reported Claims | 17,024 |  |  |  |  |  |  |  |  |
Novae | Accident Year 2015 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Net claim and allocated claim adjustment expense reserves at the Acquisition Date | 184,606 |  |  |  |  |  |  |  |  |
Net incurred claims and allocated claim adjustment expenses from the Acquisition Date to December 31, 2017 | 0 |  |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | 184,606 |  |  |  |  |  |  |  |  |
Total of Incurred-But-Not-Reported Liabilities Plus Expected Development on Reported Claims | 36,619 |  |  |  |  |  |  |  |  |
Novae | Accident Year 2016 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Net claim and allocated claim adjustment expense reserves at the Acquisition Date | 307,014 |  |  |  |  |  |  |  |  |
Net incurred claims and allocated claim adjustment expenses from the Acquisition Date to December 31, 2017 | 0 |  |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | 307,014 |  |  |  |  |  |  |  |  |
Total of Incurred-But-Not-Reported Liabilities Plus Expected Development on Reported Claims | 54,356 |  |  |  |  |  |  |  |  |
Novae | Accident Year 2017 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Net claim and allocated claim adjustment expense reserves at the Acquisition Date | 293,520 |  |  |  |  |  |  |  |  |
Net incurred claims and allocated claim adjustment expenses from the Acquisition Date to December 31, 2017 | 135,493 |  |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | 429,013 |  |  |  |  |  |  |  |  |
Total of Incurred-But-Not-Reported Liabilities Plus Expected Development on Reported Claims | 222,330 |  |  |  |  |  |  |  |  |
Insurance | Property and Other |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | 3,807,431 |  |  |  |  |  |  |  |  |
Insurance | Property and Other | Accident Year 2008 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | 216,806 | $ 217,846 | $ 218,851 | $ 220,616 | $ 225,007 | $ 226,472 | $ 242,139 | $ 251,722 | $ 260,206 | $ 312,164
Total of Incurred-But-Not-Reported Liabilities Plus Expected Development on Reported Claims | $ 982 |  |  |  |  |  |  |  |  |
Cumulative Number of Reported Claims | claim | 1,573 |  |  |  |  |  |  |  |  |
Insurance | Property and Other | Accident Year 2009 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | $ 78,623 | 78,368 | 78,720 | 78,501 | 80,718 | 82,683 | 89,993 | 99,367 | 117,662 |
Total of Incurred-But-Not-Reported Liabilities Plus Expected Development on Reported Claims | $ 971 |  |  |  |  |  |  |  |  |
Cumulative Number of Reported Claims | claim | 1,483 |  |  |  |  |  |  |  |  |
Insurance | Property and Other | Accident Year 2010 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | $ 115,289 | 115,740 | 116,020 | 116,888 | 122,472 | 147,881 | 155,343 | 175,554 |  |
Total of Incurred-But-Not-Reported Liabilities Plus Expected Development on Reported Claims | $ 687 |  |  |  |  |  |  |  |  |
Cumulative Number of Reported Claims | claim | 2,310 |  |  |  |  |  |  |  |  |
Insurance | Property and Other | Accident Year 2011 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | $ 309,638 | 309,197 | 310,404 | 313,281 | 333,911 | 356,524 | 380,921 |  |  |
Total of Incurred-But-Not-Reported Liabilities Plus Expected Development on Reported Claims | $ 2,836 |  |  |  |  |  |  |  |  |
Cumulative Number of Reported Claims | claim | 3,737 |  |  |  |  |  |  |  |  |
Insurance | Property and Other | Accident Year 2012 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | $ 418,869 | 424,475 | 428,524 | 448,763 | 472,088 | 461,790 |  |  |  |
Total of Incurred-But-Not-Reported Liabilities Plus Expected Development on Reported Claims | $ 9,739 |  |  |  |  |  |  |  |  |
Cumulative Number of Reported Claims | claim | 27,701 |  |  |  |  |  |  |  |  |
Insurance | Property and Other | Accident Year 2013 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | $ 380,800 | 381,550 | 387,093 | 414,394 | 419,392 |  |  |  |  |
Total of Incurred-But-Not-Reported Liabilities Plus Expected Development on Reported Claims | $ 6,117 |  |  |  |  |  |  |  |  |
Cumulative Number of Reported Claims | claim | 51,238 |  |  |  |  |  |  |  |  |
Insurance | Property and Other | Accident Year 2014 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | $ 417,691 | 436,130 | 459,996 | 463,732 |  |  |  |  |  |
Total of Incurred-But-Not-Reported Liabilities Plus Expected Development on Reported Claims | $ 6,539 |  |  |  |  |  |  |  |  |
Cumulative Number of Reported Claims | claim | 60,151 |  |  |  |  |  |  |  |  |
Insurance | Property and Other | Accident Year 2015 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | $ 355,883 | 373,071 | 373,256 |  |  |  |  |  |  |
Total of Incurred-But-Not-Reported Liabilities Plus Expected Development on Reported Claims | $ 12,284 |  |  |  |  |  |  |  |  |
Cumulative Number of Reported Claims | claim | 43,790 |  |  |  |  |  |  |  |  |
Insurance | Property and Other | Accident Year 2016 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | $ 574,267 | 523,086 |  |  |  |  |  |  |  |
Total of Incurred-But-Not-Reported Liabilities Plus Expected Development on Reported Claims | $ 40,961 |  |  |  |  |  |  |  |  |
Cumulative Number of Reported Claims | claim | 66,488 |  |  |  |  |  |  |  |  |
Insurance | Property and Other | Accident Year 2017 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | $ 939,565 |  |  |  |  |  |  |  |  |
Total of Incurred-But-Not-Reported Liabilities Plus Expected Development on Reported Claims | $ 333,630 |  |  |  |  |  |  |  |  |
Cumulative Number of Reported Claims | claim | 237,332 |  |  |  |  |  |  |  |  |
Insurance | Marine |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | $ 741,224 |  |  |  |  |  |  |  |  |
Insurance | Marine | Accident Year 2008 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | 82,848 | 82,789 | 83,051 | 83,432 | 87,201 | 93,587 | 100,793 | 101,872 | 106,731 | 99,618
Total of Incurred-But-Not-Reported Liabilities Plus Expected Development on Reported Claims | $ 381 |  |  |  |  |  |  |  |  |
Cumulative Number of Reported Claims | claim | 516 |  |  |  |  |  |  |  |  |
Insurance | Marine | Accident Year 2009 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | $ 52,428 | 52,523 | 53,622 | 55,027 | 57,213 | 64,601 | 69,932 | 74,298 | 80,665 |
Total of Incurred-But-Not-Reported Liabilities Plus Expected Development on Reported Claims | $ 528 |  |  |  |  |  |  |  |  |
Cumulative Number of Reported Claims | claim | 477 |  |  |  |  |  |  |  |  |
Insurance | Marine | Accident Year 2010 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | $ 45,785 | 47,397 | 48,823 | 51,663 | 53,574 | 66,639 | 70,685 | 68,603 |  |
Total of Incurred-But-Not-Reported Liabilities Plus Expected Development on Reported Claims | $ 735 |  |  |  |  |  |  |  |  |
Cumulative Number of Reported Claims | claim | 472 |  |  |  |  |  |  |  |  |
Insurance | Marine | Accident Year 2011 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | $ 68,008 | 65,919 | 65,707 | 65,697 | 72,463 | 78,611 | 90,659 |  |  |
Total of Incurred-But-Not-Reported Liabilities Plus Expected Development on Reported Claims | $ 1,549 |  |  |  |  |  |  |  |  |
Cumulative Number of Reported Claims | claim | 603 |  |  |  |  |  |  |  |  |
Insurance | Marine | Accident Year 2012 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | $ 74,541 | 71,917 | 70,942 | 68,842 | 82,729 | 89,703 |  |  |  |
Total of Incurred-But-Not-Reported Liabilities Plus Expected Development on Reported Claims | $ 12,824 |  |  |  |  |  |  |  |  |
Cumulative Number of Reported Claims | claim | 700 |  |  |  |  |  |  |  |  |
Insurance | Marine | Accident Year 2013 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | $ 83,064 | 97,777 | 96,722 | 101,276 | 80,034 |  |  |  |  |
Total of Incurred-But-Not-Reported Liabilities Plus Expected Development on Reported Claims | $ 4,121 |  |  |  |  |  |  |  |  |
Cumulative Number of Reported Claims | claim | 733 |  |  |  |  |  |  |  |  |
Insurance | Marine | Accident Year 2014 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | $ 44,439 | 48,471 | 44,562 | 59,665 |  |  |  |  |  |
Total of Incurred-But-Not-Reported Liabilities Plus Expected Development on Reported Claims | $ 7,167 |  |  |  |  |  |  |  |  |
Cumulative Number of Reported Claims | claim | 799 |  |  |  |  |  |  |  |  |
Insurance | Marine | Accident Year 2015 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | $ 136,608 | 139,931 | 158,697 |  |  |  |  |  |  |
Total of Incurred-But-Not-Reported Liabilities Plus Expected Development on Reported Claims | $ 16,023 |  |  |  |  |  |  |  |  |
Cumulative Number of Reported Claims | claim | 915 |  |  |  |  |  |  |  |  |
Insurance | Marine | Accident Year 2016 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | $ 78,864 | 86,324 |  |  |  |  |  |  |  |
Total of Incurred-But-Not-Reported Liabilities Plus Expected Development on Reported Claims | $ 19,460 |  |  |  |  |  |  |  |  |
Cumulative Number of Reported Claims | claim | 1,372 |  |  |  |  |  |  |  |  |
Insurance | Marine | Accident Year 2017 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | $ 74,639 |  |  |  |  |  |  |  |  |
Total of Incurred-But-Not-Reported Liabilities Plus Expected Development on Reported Claims | $ 48,739 |  |  |  |  |  |  |  |  |
Cumulative Number of Reported Claims | claim | 1,772 |  |  |  |  |  |  |  |  |
Insurance | Aviation |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | $ 169,650 |  |  |  |  |  |  |  |  |
Insurance | Aviation | Accident Year 2008 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | 5,905 | 5,996 | 5,851 | 5,937 | 7,108 | 8,256 | 8,354 | 8,516 | 12,021 | 14,485
Total of Incurred-But-Not-Reported Liabilities Plus Expected Development on Reported Claims | $ 42 |  |  |  |  |  |  |  |  |
Cumulative Number of Reported Claims | claim | 187 |  |  |  |  |  |  |  |  |
Insurance | Aviation | Accident Year 2009 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | $ 14,388 | 14,661 | 15,494 | 16,674 | 16,974 | 18,146 | 18,800 | 14,608 | 17,505 |
Total of Incurred-But-Not-Reported Liabilities Plus Expected Development on Reported Claims | $ 68 |  |  |  |  |  |  |  |  |
Cumulative Number of Reported Claims | claim | 317 |  |  |  |  |  |  |  |  |
Insurance | Aviation | Accident Year 2010 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | $ 8,574 | 8,784 | 8,739 | 8,807 | 9,791 | 11,460 | 11,729 | 12,939 |  |
Total of Incurred-But-Not-Reported Liabilities Plus Expected Development on Reported Claims | $ 131 |  |  |  |  |  |  |  |  |
Cumulative Number of Reported Claims | claim | 521 |  |  |  |  |  |  |  |  |
Insurance | Aviation | Accident Year 2011 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | $ 7,257 | 7,290 | 8,437 | 9,568 | 12,791 | 15,400 | 17,725 |  |  |
Total of Incurred-But-Not-Reported Liabilities Plus Expected Development on Reported Claims | $ 218 |  |  |  |  |  |  |  |  |
Cumulative Number of Reported Claims | claim | 734 |  |  |  |  |  |  |  |  |
Insurance | Aviation | Accident Year 2012 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | $ 7,730 | 7,775 | 8,724 | 10,807 | 10,681 | 12,788 |  |  |  |
Total of Incurred-But-Not-Reported Liabilities Plus Expected Development on Reported Claims | $ 320 |  |  |  |  |  |  |  |  |
Cumulative Number of Reported Claims | claim | 874 |  |  |  |  |  |  |  |  |
Insurance | Aviation | Accident Year 2013 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | $ 15,579 | 15,264 | 15,221 | 16,344 | 15,656 |  |  |  |  |
Total of Incurred-But-Not-Reported Liabilities Plus Expected Development on Reported Claims | $ 542 |  |  |  |  |  |  |  |  |
Cumulative Number of Reported Claims | claim | 1,027 |  |  |  |  |  |  |  |  |
Insurance | Aviation | Accident Year 2014 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | $ 21,859 | 24,368 | 23,046 | 20,437 |  |  |  |  |  |
Total of Incurred-But-Not-Reported Liabilities Plus Expected Development on Reported Claims | $ 982 |  |  |  |  |  |  |  |  |
Cumulative Number of Reported Claims | claim | 1,324 |  |  |  |  |  |  |  |  |
Insurance | Aviation | Accident Year 2015 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | $ 29,965 | 28,512 | 29,772 |  |  |  |  |  |  |
Total of Incurred-But-Not-Reported Liabilities Plus Expected Development on Reported Claims | $ 2,646 |  |  |  |  |  |  |  |  |
Cumulative Number of Reported Claims | claim | 1,917 |  |  |  |  |  |  |  |  |
Insurance | Aviation | Accident Year 2016 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | $ 33,641 | 29,178 |  |  |  |  |  |  |  |
Total of Incurred-But-Not-Reported Liabilities Plus Expected Development on Reported Claims | $ 5,145 |  |  |  |  |  |  |  |  |
Cumulative Number of Reported Claims | claim | 1,692 |  |  |  |  |  |  |  |  |
Insurance | Aviation | Accident Year 2017 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | $ 24,752 |  |  |  |  |  |  |  |  |
Total of Incurred-But-Not-Reported Liabilities Plus Expected Development on Reported Claims | $ 12,737 |  |  |  |  |  |  |  |  |
Cumulative Number of Reported Claims | claim | 1,177 |  |  |  |  |  |  |  |  |
Insurance | Credit and Political Risk |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | $ 684,497 |  |  |  |  |  |  |  |  |
Insurance | Credit and Political Risk | Accident Year 2008 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | 44,408 | 44,410 | 45,200 | 45,600 | 45,551 | 45,551 | 45,554 | 48,715 | 63,552 | 52,993
Total of Incurred-But-Not-Reported Liabilities Plus Expected Development on Reported Claims | $ 0 |  |  |  |  |  |  |  |  |
Cumulative Number of Reported Claims | claim | 9 |  |  |  |  |  |  |  |  |
Insurance | Credit and Political Risk | Accident Year 2009 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | $ 339,558 | 339,595 | 335,315 | 335,295 | 335,435 | 335,558 | 326,037 | 305,292 | 248,084 |
Total of Incurred-But-Not-Reported Liabilities Plus Expected Development on Reported Claims | $ 2,040 |  |  |  |  |  |  |  |  |
Cumulative Number of Reported Claims | claim | 24 |  |  |  |  |  |  |  |  |
Insurance | Credit and Political Risk | Accident Year 2010 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | $ 90,885 | 72,105 | 65,015 | 64,981 | 65,598 | 63,259 | 63,179 | 62,415 |  |
Total of Incurred-But-Not-Reported Liabilities Plus Expected Development on Reported Claims | $ 13,200 |  |  |  |  |  |  |  |  |
Cumulative Number of Reported Claims | claim | 6 |  |  |  |  |  |  |  |  |
Insurance | Credit and Political Risk | Accident Year 2011 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | $ 33,604 | 45,036 | 48,333 | 48,361 | 47,706 | 48,665 | 58,154 |  |  |
Total of Incurred-But-Not-Reported Liabilities Plus Expected Development on Reported Claims | $ 5,973 |  |  |  |  |  |  |  |  |
Cumulative Number of Reported Claims | claim | 4 |  |  |  |  |  |  |  |  |
Insurance | Credit and Political Risk | Accident Year 2012 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | $ 47 | 10,322 | 12,447 | 12,435 | 15,672 | 32,602 |  |  |  |
Total of Incurred-But-Not-Reported Liabilities Plus Expected Development on Reported Claims | $ 5 |  |  |  |  |  |  |  |  |
Cumulative Number of Reported Claims | claim | 4 |  |  |  |  |  |  |  |  |
Insurance | Credit and Political Risk | Accident Year 2013 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | $ 14,941 | 9,880 | 9,759 | 25,684 | 26,439 |  |  |  |  |
Total of Incurred-But-Not-Reported Liabilities Plus Expected Development on Reported Claims | $ 6,662 |  |  |  |  |  |  |  |  |
Cumulative Number of Reported Claims | claim | 1 |  |  |  |  |  |  |  |  |
Insurance | Credit and Political Risk | Accident Year 2014 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | $ 68,321 | 67,109 | 70,713 | 38,825 |  |  |  |  |  |
Total of Incurred-But-Not-Reported Liabilities Plus Expected Development on Reported Claims | $ 10,466 |  |  |  |  |  |  |  |  |
Cumulative Number of Reported Claims | claim | 6 |  |  |  |  |  |  |  |  |
Insurance | Credit and Political Risk | Accident Year 2015 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | $ 27,513 | 30,368 | 30,329 |  |  |  |  |  |  |
Total of Incurred-But-Not-Reported Liabilities Plus Expected Development on Reported Claims | $ 4,215 |  |  |  |  |  |  |  |  |
Cumulative Number of Reported Claims | claim | 2 |  |  |  |  |  |  |  |  |
Insurance | Credit and Political Risk | Accident Year 2016 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | $ 43,983 | 47,250 |  |  |  |  |  |  |  |
Total of Incurred-But-Not-Reported Liabilities Plus Expected Development on Reported Claims | $ 20,194 |  |  |  |  |  |  |  |  |
Cumulative Number of Reported Claims | claim | 1 |  |  |  |  |  |  |  |  |
Insurance | Credit and Political Risk | Accident Year 2017 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | $ 21,237 |  |  |  |  |  |  |  |  |
Total of Incurred-But-Not-Reported Liabilities Plus Expected Development on Reported Claims | $ 17,958 |  |  |  |  |  |  |  |  |
Cumulative Number of Reported Claims | claim | 2 |  |  |  |  |  |  |  |  |
Insurance | Professional Lines |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | $ 3,270,275 |  |  |  |  |  |  |  |  |
Insurance | Professional Lines | Accident Year 2008 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | 325,573 | 326,192 | 327,240 | 329,458 | 309,642 | 296,499 | 298,905 | 280,842 | 278,691 | 238,550
Total of Incurred-But-Not-Reported Liabilities Plus Expected Development on Reported Claims | $ 9,175 |  |  |  |  |  |  |  |  |
Cumulative Number of Reported Claims | claim | 4,558 |  |  |  |  |  |  |  |  |
Insurance | Professional Lines | Accident Year 2009 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | $ 223,737 | 215,732 | 239,428 | 238,902 | 256,295 | 245,319 | 244,751 | 244,150 | 240,818 |
Total of Incurred-But-Not-Reported Liabilities Plus Expected Development on Reported Claims | $ 13,584 |  |  |  |  |  |  |  |  |
Cumulative Number of Reported Claims | claim | 5,882 |  |  |  |  |  |  |  |  |
Insurance | Professional Lines | Accident Year 2010 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | $ 168,632 | 181,232 | 158,946 | 182,713 | 205,801 | 234,334 | 236,578 | 231,232 |  |
Total of Incurred-But-Not-Reported Liabilities Plus Expected Development on Reported Claims | $ 26,396 |  |  |  |  |  |  |  |  |
Cumulative Number of Reported Claims | claim | 5,669 |  |  |  |  |  |  |  |  |
Insurance | Professional Lines | Accident Year 2011 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | $ 352,406 | 343,782 | 330,562 | 326,255 | 333,321 | 315,654 | 313,858 |  |  |
Total of Incurred-But-Not-Reported Liabilities Plus Expected Development on Reported Claims | $ 50,239 |  |  |  |  |  |  |  |  |
Cumulative Number of Reported Claims | claim | 7,211 |  |  |  |  |  |  |  |  |
Insurance | Professional Lines | Accident Year 2012 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | $ 366,725 | 364,423 | 376,604 | 377,277 | 375,557 | 329,769 |  |  |  |
Total of Incurred-But-Not-Reported Liabilities Plus Expected Development on Reported Claims | $ 70,219 |  |  |  |  |  |  |  |  |
Cumulative Number of Reported Claims | claim | 8,279 |  |  |  |  |  |  |  |  |
Insurance | Professional Lines | Accident Year 2013 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | $ 355,777 | 365,818 | 398,578 | 397,852 | 384,755 |  |  |  |  |
Total of Incurred-But-Not-Reported Liabilities Plus Expected Development on Reported Claims | $ 95,220 |  |  |  |  |  |  |  |  |
Cumulative Number of Reported Claims | claim | 9,371 |  |  |  |  |  |  |  |  |
Insurance | Professional Lines | Accident Year 2014 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | $ 394,470 | 423,087 | 412,288 | 411,690 |  |  |  |  |  |
Total of Incurred-But-Not-Reported Liabilities Plus Expected Development on Reported Claims | $ 157,747 |  |  |  |  |  |  |  |  |
Cumulative Number of Reported Claims | claim | 9,650 |  |  |  |  |  |  |  |  |
Insurance | Professional Lines | Accident Year 2015 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | $ 383,959 | 377,725 | 377,652 |  |  |  |  |  |  |
Total of Incurred-But-Not-Reported Liabilities Plus Expected Development on Reported Claims | $ 186,383 |  |  |  |  |  |  |  |  |
Cumulative Number of Reported Claims | claim | 9,862 |  |  |  |  |  |  |  |  |
Insurance | Professional Lines | Accident Year 2016 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | $ 352,414 | 349,268 |  |  |  |  |  |  |  |
Total of Incurred-But-Not-Reported Liabilities Plus Expected Development on Reported Claims | $ 220,770 |  |  |  |  |  |  |  |  |
Cumulative Number of Reported Claims | claim | 10,728 |  |  |  |  |  |  |  |  |
Insurance | Professional Lines | Accident Year 2017 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | $ 346,582 |  |  |  |  |  |  |  |  |
Total of Incurred-But-Not-Reported Liabilities Plus Expected Development on Reported Claims | $ 302,135 |  |  |  |  |  |  |  |  |
Cumulative Number of Reported Claims | claim | 9,984 |  |  |  |  |  |  |  |  |
Insurance | Liability |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | $ 1,085,670 |  |  |  |  |  |  |  |  |
Insurance | Liability | Accident Year 2008 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | 94,165 | 108,189 | 102,444 | 101,589 | 81,949 | 82,225 | 81,785 | 80,947 | 79,836 | 82,969
Total of Incurred-But-Not-Reported Liabilities Plus Expected Development on Reported Claims | $ 11,783 |  |  |  |  |  |  |  |  |
Cumulative Number of Reported Claims | claim | 3,790 |  |  |  |  |  |  |  |  |
Insurance | Liability | Accident Year 2009 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | $ 98,999 | 98,384 | 101,180 | 83,282 | 76,431 | 67,869 | 67,410 | 64,017 | 61,469 |
Total of Incurred-But-Not-Reported Liabilities Plus Expected Development on Reported Claims | $ 10,895 |  |  |  |  |  |  |  |  |
Cumulative Number of Reported Claims | claim | 2,777 |  |  |  |  |  |  |  |  |
Insurance | Liability | Accident Year 2010 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | $ 104,296 | 105,145 | 98,086 | 99,596 | 98,134 | 98,648 | 94,231 | 79,401 |  |
Total of Incurred-But-Not-Reported Liabilities Plus Expected Development on Reported Claims | $ 12,681 |  |  |  |  |  |  |  |  |
Cumulative Number of Reported Claims | claim | 2,206 |  |  |  |  |  |  |  |  |
Insurance | Liability | Accident Year 2011 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | $ 82,128 | 83,731 | 85,243 | 87,060 | 83,118 | 75,329 | 72,584 |  |  |
Total of Incurred-But-Not-Reported Liabilities Plus Expected Development on Reported Claims | $ 19,227 |  |  |  |  |  |  |  |  |
Cumulative Number of Reported Claims | claim | 1,788 |  |  |  |  |  |  |  |  |
Insurance | Liability | Accident Year 2012 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | $ 75,342 | 68,181 | 70,770 | 73,282 | 70,645 | 70,877 |  |  |  |
Total of Incurred-But-Not-Reported Liabilities Plus Expected Development on Reported Claims | $ 27,824 |  |  |  |  |  |  |  |  |
Cumulative Number of Reported Claims | claim | 1,240 |  |  |  |  |  |  |  |  |
Insurance | Liability | Accident Year 2013 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | $ 93,221 | 87,502 | 94,258 | 94,182 | 92,153 |  |  |  |  |
Total of Incurred-But-Not-Reported Liabilities Plus Expected Development on Reported Claims | $ 24,296 |  |  |  |  |  |  |  |  |
Cumulative Number of Reported Claims | claim | 1,562 |  |  |  |  |  |  |  |  |
Insurance | Liability | Accident Year 2014 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | $ 130,035 | 128,568 | 122,686 | 106,166 |  |  |  |  |  |
Total of Incurred-But-Not-Reported Liabilities Plus Expected Development on Reported Claims | $ 41,151 |  |  |  |  |  |  |  |  |
Cumulative Number of Reported Claims | claim | 2,440 |  |  |  |  |  |  |  |  |
Insurance | Liability | Accident Year 2015 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | $ 136,615 | 126,047 | 127,321 |  |  |  |  |  |  |
Total of Incurred-But-Not-Reported Liabilities Plus Expected Development on Reported Claims | $ 61,944 |  |  |  |  |  |  |  |  |
Cumulative Number of Reported Claims | claim | 3,317 |  |  |  |  |  |  |  |  |
Insurance | Liability | Accident Year 2016 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | $ 129,225 | 123,259 |  |  |  |  |  |  |  |
Total of Incurred-But-Not-Reported Liabilities Plus Expected Development on Reported Claims | $ 90,482 |  |  |  |  |  |  |  |  |
Cumulative Number of Reported Claims | claim | 3,811 |  |  |  |  |  |  |  |  |
Insurance | Liability | Accident Year 2017 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | $ 141,644 |  |  |  |  |  |  |  |  |
Total of Incurred-But-Not-Reported Liabilities Plus Expected Development on Reported Claims | $ 129,373 |  |  |  |  |  |  |  |  |
Cumulative Number of Reported Claims | claim | 2,519 |  |  |  |  |  |  |  |  |
Reinsurance | Property and Other |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | $ 5,251,457 |  |  |  |  |  |  |  |  |
Reinsurance | Property and Other | Accident Year 2008 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | 523,591 | 523,154 | 524,422 | 529,918 | 546,034 | 557,060 | 571,142 | 593,015 | 577,309 | 677,556
Total of Incurred-But-Not-Reported Liabilities Plus Expected Development on Reported Claims | (224) |  |  |  |  |  |  |  |  |
Reinsurance | Property and Other | Accident Year 2009 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | 202,300 | 205,145 | 203,261 | 209,335 | 230,351 | 237,339 | 250,630 | 288,510 | 344,543 |
Total of Incurred-But-Not-Reported Liabilities Plus Expected Development on Reported Claims | 1,018 |  |  |  |  |  |  |  |  |
Reinsurance | Property and Other | Accident Year 2010 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | 581,616 | 583,563 | 591,331 | 597,427 | 594,238 | 580,601 | 610,563 | 619,241 |  |
Total of Incurred-But-Not-Reported Liabilities Plus Expected Development on Reported Claims | 4,587 |  |  |  |  |  |  |  |  |
Reinsurance | Property and Other | Accident Year 2011 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | 1,020,771 | 1,022,452 | 1,047,944 | 1,064,864 | 1,105,415 | 1,105,962 | 1,092,977 |  |  |
Total of Incurred-But-Not-Reported Liabilities Plus Expected Development on Reported Claims | 8,207 |  |  |  |  |  |  |  |  |
Reinsurance | Property and Other | Accident Year 2012 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | 394,332 | 399,193 | 415,327 | 445,932 | 456,173 | 488,776 |  |  |  |
Total of Incurred-But-Not-Reported Liabilities Plus Expected Development on Reported Claims | 6,544 |  |  |  |  |  |  |  |  |
Reinsurance | Property and Other | Accident Year 2013 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | 397,673 | 403,217 | 422,160 | 452,433 | 475,162 |  |  |  |  |
Total of Incurred-But-Not-Reported Liabilities Plus Expected Development on Reported Claims | 4,083 |  |  |  |  |  |  |  |  |
Reinsurance | Property and Other | Accident Year 2014 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | 438,815 | 448,887 | 461,961 | 441,147 |  |  |  |  |  |
Total of Incurred-But-Not-Reported Liabilities Plus Expected Development on Reported Claims | 45,519 |  |  |  |  |  |  |  |  |
Reinsurance | Property and Other | Accident Year 2015 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | 369,734 | 368,320 | 386,614 |  |  |  |  |  |  |
Total of Incurred-But-Not-Reported Liabilities Plus Expected Development on Reported Claims | 27,033 |  |  |  |  |  |  |  |  |
Reinsurance | Property and Other | Accident Year 2016 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | 452,169 | 452,342 |  |  |  |  |  |  |  |
Total of Incurred-But-Not-Reported Liabilities Plus Expected Development on Reported Claims | 96,090 |  |  |  |  |  |  |  |  |
Reinsurance | Property and Other | Accident Year 2017 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | 870,456 |  |  |  |  |  |  |  |  |
Total of Incurred-But-Not-Reported Liabilities Plus Expected Development on Reported Claims | 488,104 |  |  |  |  |  |  |  |  |
Reinsurance | Professional Lines |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | 1,948,434 |  |  |  |  |  |  |  |  |
Reinsurance | Professional Lines | Accident Year 2008 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | 169,515 | 172,937 | 173,217 | 174,286 | 173,316 | 176,767 | 178,530 | 182,587 | 183,064 | 176,166
Total of Incurred-But-Not-Reported Liabilities Plus Expected Development on Reported Claims | 6,938 |  |  |  |  |  |  |  |  |
Reinsurance | Professional Lines | Accident Year 2009 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | 181,665 | 190,811 | 194,753 | 209,625 | 210,084 | 219,447 | 216,737 | 212,046 | 212,285 |
Total of Incurred-But-Not-Reported Liabilities Plus Expected Development on Reported Claims | 11,657 |  |  |  |  |  |  |  |  |
Reinsurance | Professional Lines | Accident Year 2010 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | 180,219 | 189,880 | 197,548 | 215,043 | 215,298 | 212,359 | 211,397 | 211,273 |  |
Total of Incurred-But-Not-Reported Liabilities Plus Expected Development on Reported Claims | 24,929 |  |  |  |  |  |  |  |  |
Reinsurance | Professional Lines | Accident Year 2011 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | 201,077 | 208,973 | 209,837 | 212,439 | 203,706 | 202,676 | 202,504 |  |  |
Total of Incurred-But-Not-Reported Liabilities Plus Expected Development on Reported Claims | 51,009 |  |  |  |  |  |  |  |  |
Reinsurance | Professional Lines | Accident Year 2012 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | 213,601 | 223,492 | 224,737 | 222,600 | 217,184 | 210,612 |  |  |  |
Total of Incurred-But-Not-Reported Liabilities Plus Expected Development on Reported Claims | 75,647 |  |  |  |  |  |  |  |  |
Reinsurance | Professional Lines | Accident Year 2013 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | 214,477 | 214,855 | 216,528 | 215,425 | 210,196 |  |  |  |  |
Total of Incurred-But-Not-Reported Liabilities Plus Expected Development on Reported Claims | 101,607 |  |  |  |  |  |  |  |  |
Reinsurance | Professional Lines | Accident Year 2014 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | 219,968 | 219,960 | 219,966 | 219,927 |  |  |  |  |  |
Total of Incurred-But-Not-Reported Liabilities Plus Expected Development on Reported Claims | 85,643 |  |  |  |  |  |  |  |  |
Reinsurance | Professional Lines | Accident Year 2015 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | 215,178 | 212,852 | 212,536 |  |  |  |  |  |  |
Total of Incurred-But-Not-Reported Liabilities Plus Expected Development on Reported Claims | 124,029 |  |  |  |  |  |  |  |  |
Reinsurance | Professional Lines | Accident Year 2016 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | 196,852 | 195,527 |  |  |  |  |  |  |  |
Total of Incurred-But-Not-Reported Liabilities Plus Expected Development on Reported Claims | 140,194 |  |  |  |  |  |  |  |  |
Reinsurance | Professional Lines | Accident Year 2017 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | 155,882 |  |  |  |  |  |  |  |  |
Total of Incurred-But-Not-Reported Liabilities Plus Expected Development on Reported Claims | 144,098 |  |  |  |  |  |  |  |  |
Reinsurance | Credit and Surety |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | 1,243,697 |  |  |  |  |  |  |  |  |
Reinsurance | Credit and Surety | Accident Year 2008 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | 98,714 | 100,277 | 100,674 | 101,903 | 105,698 | 106,950 | 105,765 | 107,787 | 116,362 | 87,400
Total of Incurred-But-Not-Reported Liabilities Plus Expected Development on Reported Claims | 1,231 |  |  |  |  |  |  |  |  |
Reinsurance | Credit and Surety | Accident Year 2009 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | 96,783 | 98,469 | 98,845 | 102,079 | 108,149 | 108,442 | 109,211 | 125,656 | 147,192 |
Total of Incurred-But-Not-Reported Liabilities Plus Expected Development on Reported Claims | 1,874 |  |  |  |  |  |  |  |  |
Reinsurance | Credit and Surety | Accident Year 2010 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | 78,645 | 80,680 | 82,003 | 89,657 | 93,648 | 96,821 | 103,332 | 121,893 |  |
Total of Incurred-But-Not-Reported Liabilities Plus Expected Development on Reported Claims | 5,222 |  |  |  |  |  |  |  |  |
Reinsurance | Credit and Surety | Accident Year 2011 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | 104,997 | 106,804 | 115,523 | 117,586 | 110,294 | 112,031 | 124,030 |  |  |
Total of Incurred-But-Not-Reported Liabilities Plus Expected Development on Reported Claims | 7,464 |  |  |  |  |  |  |  |  |
Reinsurance | Credit and Surety | Accident Year 2012 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | 135,845 | 144,084 | 152,678 | 155,634 | 152,873 | 163,535 |  |  |  |
Total of Incurred-But-Not-Reported Liabilities Plus Expected Development on Reported Claims | 11,848 |  |  |  |  |  |  |  |  |
Reinsurance | Credit and Surety | Accident Year 2013 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | 139,679 | 144,095 | 148,080 | 157,311 | 168,361 |  |  |  |  |
Total of Incurred-But-Not-Reported Liabilities Plus Expected Development on Reported Claims | 17,857 |  |  |  |  |  |  |  |  |
Reinsurance | Credit and Surety | Accident Year 2014 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | 142,909 | 146,647 | 139,449 | 138,056 |  |  |  |  |  |
Total of Incurred-But-Not-Reported Liabilities Plus Expected Development on Reported Claims | 27,627 |  |  |  |  |  |  |  |  |
Reinsurance | Credit and Surety | Accident Year 2015 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | 165,822 | 170,980 | 163,467 |  |  |  |  |  |  |
Total of Incurred-But-Not-Reported Liabilities Plus Expected Development on Reported Claims | 36,473 |  |  |  |  |  |  |  |  |
Reinsurance | Credit and Surety | Accident Year 2016 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | 144,741 | 144,583 |  |  |  |  |  |  |  |
Total of Incurred-But-Not-Reported Liabilities Plus Expected Development on Reported Claims | 50,815 |  |  |  |  |  |  |  |  |
Reinsurance | Credit and Surety | Accident Year 2017 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | 135,562 |  |  |  |  |  |  |  |  |
Total of Incurred-But-Not-Reported Liabilities Plus Expected Development on Reported Claims | 74,667 |  |  |  |  |  |  |  |  |
Reinsurance | Motor |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | 1,713,131 |  |  |  |  |  |  |  |  |
Reinsurance | Motor | Accident Year 2008 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | 62,557 | 61,702 | 65,983 | 72,330 | 77,027 | 77,937 | 80,897 | 78,193 | 78,924 | 74,058
Total of Incurred-But-Not-Reported Liabilities Plus Expected Development on Reported Claims | 20,916 |  |  |  |  |  |  |  |  |
Reinsurance | Motor | Accident Year 2009 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | 84,458 | 82,093 | 87,995 | 97,089 | 96,069 | 93,917 | 91,915 | 83,784 | 85,779 |
Total of Incurred-But-Not-Reported Liabilities Plus Expected Development on Reported Claims | 21,053 |  |  |  |  |  |  |  |  |
Reinsurance | Motor | Accident Year 2010 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | 87,253 | 90,839 | 100,707 | 106,058 | 112,285 | 113,304 | 112,528 | 103,990 |  |
Total of Incurred-But-Not-Reported Liabilities Plus Expected Development on Reported Claims | 24,419 |  |  |  |  |  |  |  |  |
Reinsurance | Motor | Accident Year 2011 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | 150,818 | 161,958 | 171,007 | 175,021 | 168,734 | 164,579 | 160,444 |  |  |
Total of Incurred-But-Not-Reported Liabilities Plus Expected Development on Reported Claims | 33,732 |  |  |  |  |  |  |  |  |
Reinsurance | Motor | Accident Year 2012 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | 141,923 | 151,820 | 156,957 | 164,734 | 176,870 | 186,033 |  |  |  |
Total of Incurred-But-Not-Reported Liabilities Plus Expected Development on Reported Claims | 25,982 |  |  |  |  |  |  |  |  |
Reinsurance | Motor | Accident Year 2013 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | 143,186 | 146,799 | 156,692 | 168,554 | 169,876 |  |  |  |  |
Total of Incurred-But-Not-Reported Liabilities Plus Expected Development on Reported Claims | 26,041 |  |  |  |  |  |  |  |  |
Reinsurance | Motor | Accident Year 2014 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | 185,570 | 188,725 | 193,691 | 190,363 |  |  |  |  |  |
Total of Incurred-But-Not-Reported Liabilities Plus Expected Development on Reported Claims | 24,003 |  |  |  |  |  |  |  |  |
Reinsurance | Motor | Accident Year 2015 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | 233,172 | 229,110 | 231,614 |  |  |  |  |  |  |
Total of Incurred-But-Not-Reported Liabilities Plus Expected Development on Reported Claims | 37,198 |  |  |  |  |  |  |  |  |
Reinsurance | Motor | Accident Year 2016 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | 276,126 | 255,354 |  |  |  |  |  |  |  |
Total of Incurred-But-Not-Reported Liabilities Plus Expected Development on Reported Claims | 55,173 |  |  |  |  |  |  |  |  |
Reinsurance | Motor | Accident Year 2017 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | 348,068 |  |  |  |  |  |  |  |  |
Total of Incurred-But-Not-Reported Liabilities Plus Expected Development on Reported Claims | 170,065 |  |  |  |  |  |  |  |  |
Reinsurance | Liability |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | 1,912,565 |  |  |  |  |  |  |  |  |
Reinsurance | Liability | Accident Year 2008 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | 86,008 | 95,649 | 106,942 | 111,873 | 133,917 | 139,564 | 141,553 | 141,152 | 140,460 | $ 140,069
Total of Incurred-But-Not-Reported Liabilities Plus Expected Development on Reported Claims | 10,016 |  |  |  |  |  |  |  |  |
Reinsurance | Liability | Accident Year 2009 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | 171,979 | 181,488 | 195,679 | 208,301 | 188,090 | 180,596 | 182,970 | 176,187 | $ 175,100 |
Total of Incurred-But-Not-Reported Liabilities Plus Expected Development on Reported Claims | 23,215 |  |  |  |  |  |  |  |  |
Reinsurance | Liability | Accident Year 2010 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | 166,533 | 182,794 | 192,051 | 202,649 | 184,180 | 183,773 | 172,261 | $ 173,358 |  |
Total of Incurred-But-Not-Reported Liabilities Plus Expected Development on Reported Claims | 29,101 |  |  |  |  |  |  |  |  |
Reinsurance | Liability | Accident Year 2011 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | 196,277 | 196,948 | 200,190 | 193,228 | 175,279 | 173,815 | $ 174,125 |  |  |
Total of Incurred-But-Not-Reported Liabilities Plus Expected Development on Reported Claims | 34,097 |  |  |  |  |  |  |  |  |
Reinsurance | Liability | Accident Year 2012 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | 172,124 | 174,765 | 173,596 | 168,956 | 164,742 | $ 168,641 |  |  |  |
Total of Incurred-But-Not-Reported Liabilities Plus Expected Development on Reported Claims | 43,129 |  |  |  |  |  |  |  |  |
Reinsurance | Liability | Accident Year 2013 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | 185,321 | 185,689 | 183,683 | 177,606 | $ 173,966 |  |  |  |  |
Total of Incurred-But-Not-Reported Liabilities Plus Expected Development on Reported Claims | 71,652 |  |  |  |  |  |  |  |  |
Reinsurance | Liability | Accident Year 2014 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | 202,130 | 206,100 | 204,323 | $ 201,355 |  |  |  |  |  |
Total of Incurred-But-Not-Reported Liabilities Plus Expected Development on Reported Claims | 91,483 |  |  |  |  |  |  |  |  |
Reinsurance | Liability | Accident Year 2015 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | 217,480 | 216,518 | $ 216,076 |  |  |  |  |  |  |
Total of Incurred-But-Not-Reported Liabilities Plus Expected Development on Reported Claims | 125,377 |  |  |  |  |  |  |  |  |
Reinsurance | Liability | Accident Year 2016 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | 247,768 | $ 241,952 |  |  |  |  |  |  |  |
Total of Incurred-But-Not-Reported Liabilities Plus Expected Development on Reported Claims | 171,869 |  |  |  |  |  |  |  |  |
Reinsurance | Liability | Accident Year 2017 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | 266,945 |  |  |  |  |  |  |  |  |
Total of Incurred-But-Not-Reported Liabilities Plus Expected Development on Reported Claims | $ 226,036 |  |  |  |  |  |  |  |  |

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