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Reserve For Losses, LAE And Future Policy Benefit Reserve (Ultimate Loss and ALAE And Paid Loss And ALAE, Net Of Reinsurance) (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
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Claims Development [Line Items] |  |  |  |  |  |  |  |
Liabilities for claims and claim adjustment expenses, net of reinsurance | $ 11,768,596 |  |  |  |  |  |  |
United States Reinsurance [Member] | Casualty Business [Member] |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance | 3,281,926 |  |  |  |  |  |  |
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | 1,692,901 |  |  |  |  |  |  |
All outstanding liabilities prior to 2012, net of reinsurance | 607,385 |  |  |  |  |  |  |
Liabilities for claims and claim adjustment expenses, net of reinsurance | 2,196,410 |  |  |  |  |  |  |
United States Reinsurance [Member] | Casualty Business [Member] | 2012 [Member] |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance | 312,483 | $ 324,139 | $ 320,958 | $ 321,099 | $ 325,134 | $ 329,084 | $ 395,794 | $ 401,018
Total of IBNR Liabilities Plus Expected Development on Reported Claims | 1,539 |  |  |  |  |  |  |
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | 286,409 | 272,046 | 218,653 | 187,286 | 143,510 | 82,995 | 38,496 | 9,986
United States Reinsurance [Member] | Casualty Business [Member] | 2013 [Member] |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance | 355,118 | 362,781 | 372,409 | 388,287 | 385,643 | 388,323 | 310,935 |
Total of IBNR Liabilities Plus Expected Development on Reported Claims | 3,851 |  |  |  |  |  |  |
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | 310,168 | 285,756 | 211,273 | 170,868 | 108,801 | 48,929 | 14,842 |
United States Reinsurance [Member] | Casualty Business [Member] | 2014 [Member] |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance | 351,033 | 357,608 | 375,404 | 392,379 | 383,657 | 367,492 |  |
Total of IBNR Liabilities Plus Expected Development on Reported Claims | 2,232 |  |  |  |  |  |  |
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | 294,533 | 254,077 | 164,552 | 110,249 | 54,255 | 18,809 |  |
United States Reinsurance [Member] | Casualty Business [Member] | 2015 [Member] |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance | 337,332 | 350,790 | 352,983 | 354,265 | 326,346 |  |  |
Total of IBNR Liabilities Plus Expected Development on Reported Claims | 10,184 |  |  |  |  |  |  |
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | 257,511 | 206,397 | 107,458 | 53,621 | 19,902 |  |  |
United States Reinsurance [Member] | Casualty Business [Member] | 2016 [Member] |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance | 343,004 | 355,804 | 354,822 | 330,362 |  |  |  |
Total of IBNR Liabilities Plus Expected Development on Reported Claims | 56,353 |  |  |  |  |  |  |
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | 193,804 | 137,219 | 58,310 | 18,927 |  |  |  |
United States Reinsurance [Member] | Casualty Business [Member] | 2017 [Member] |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance | 342,896 | 347,147 | 346,836 |  |  |  |  |
Total of IBNR Liabilities Plus Expected Development on Reported Claims | 105,550 |  |  |  |  |  |  |
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | 142,335 | 73,023 | 25,800 |  |  |  |  |
United States Reinsurance [Member] | Casualty Business [Member] | 2018 [Member] |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance | 472,532 | 484,218 |  |  |  |  |  |
Total of IBNR Liabilities Plus Expected Development on Reported Claims | 259,800 |  |  |  |  |  |  |
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | 104,690 | 63,140 |  |  |  |  |  |
United States Reinsurance [Member] | Casualty Business [Member] | 2019 [Member] |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance | 767,529 |  |  |  |  |  |  |
Total of IBNR Liabilities Plus Expected Development on Reported Claims | 488,182 |  |  |  |  |  |  |
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | 103,453 |  |  |  |  |  |  |
United States Reinsurance [Member] | Property Business [Member] |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance | 7,421,556 |  |  |  |  |  |  |
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | 5,878,758 |  |  |  |  |  |  |
All outstanding liabilities prior to 2012, net of reinsurance | 29,929 |  |  |  |  |  |  |
Liabilities for claims and claim adjustment expenses, net of reinsurance | 1,572,727 |  |  |  |  |  |  |
United States Reinsurance [Member] | Property Business [Member] | 2012 [Member] |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance | 694,576 | 692,079 | 706,782 | 713,237 | 715,961 | 723,151 | 723,851 | 937,720
Total of IBNR Liabilities Plus Expected Development on Reported Claims | 1,112 |  |  |  |  |  |  |
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | 666,768 | 651,550 | 646,572 | 621,013 | 598,289 | 520,244 | 402,305 | 242,315
United States Reinsurance [Member] | Property Business [Member] | 2013 [Member] |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance | 310,199 | 308,557 | 310,942 | 314,637 | 352,687 | 405,338 | 622,108 |
Total of IBNR Liabilities Plus Expected Development on Reported Claims | 1,099 |  |  |  |  |  |  |
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | 302,756 | 300,708 | 296,074 | 289,130 | 269,014 | 250,850 | 234,464 |
United States Reinsurance [Member] | Property Business [Member] | 2014 [Member] |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance | 397,683 | 396,641 | 402,129 | 437,409 | 516,189 | 603,258 |  |
Total of IBNR Liabilities Plus Expected Development on Reported Claims | 2,674 |  |  |  |  |  |  |
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | 375,988 | 373,060 | 362,825 | 338,030 | 289,430 | 189,598 |  |
United States Reinsurance [Member] | Property Business [Member] | 2015 [Member] |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance | 456,195 | 451,694 | 476,348 | 534,178 | 673,913 |  |  |
Total of IBNR Liabilities Plus Expected Development on Reported Claims | 5,655 |  |  |  |  |  |  |
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | 419,757 | 405,614 | 378,235 | 320,310 | 225,655 |  |  |
United States Reinsurance [Member] | Property Business [Member] | 2016 [Member] |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance | 788,551 | 797,339 | 816,765 | 972,881 |  |  |  |
Total of IBNR Liabilities Plus Expected Development on Reported Claims | 10,293 |  |  |  |  |  |  |
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | 735,678 | 681,502 | 582,985 | 291,462 |  |  |  |
United States Reinsurance [Member] | Property Business [Member] | 2017 [Member] |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance | 2,231,384 | 2,117,747 | 1,564,165 |  |  |  |  |
Total of IBNR Liabilities Plus Expected Development on Reported Claims | 16,538 |  |  |  |  |  |  |
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | 1,744,822 | 1,422,328 | 545,551 |  |  |  |  |
United States Reinsurance [Member] | Property Business [Member] | 2018 [Member] |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance | 1,572,138 | 1,728,705 |  |  |  |  |  |
Total of IBNR Liabilities Plus Expected Development on Reported Claims | 88,063 |  |  |  |  |  |  |
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | 1,064,431 | 409,225 |  |  |  |  |  |
United States Reinsurance [Member] | Property Business [Member] | 2019 [Member] |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance | 970,831 |  |  |  |  |  |  |
Total of IBNR Liabilities Plus Expected Development on Reported Claims | 329,576 |  |  |  |  |  |  |
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | 568,556 |  |  |  |  |  |  |
International [Member] | Casualty Business [Member] |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance | 1,496,922 |  |  |  |  |  |  |
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | 694,615 |  |  |  |  |  |  |
All outstanding liabilities prior to 2012, net of reinsurance | 116,104 |  |  |  |  |  |  |
Liabilities for claims and claim adjustment expenses, net of reinsurance | 918,411 |  |  |  |  |  |  |
International [Member] | Casualty Business [Member] | 2012 [Member] |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance | 101,872 | 116,283 | 118,941 | 117,350 | 135,230 | 135,234 | 146,421 | 224,614
Total of IBNR Liabilities Plus Expected Development on Reported Claims | 6,225 |  |  |  |  |  |  |
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | 88,278 | 83,253 | 76,921 | 66,234 | 56,420 | 46,015 | 30,090 | 18,875
International [Member] | Casualty Business [Member] | 2013 [Member] |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance | 130,124 | 138,355 | 141,645 | 144,869 | 164,973 | 168,277 | 184,497 |
Total of IBNR Liabilities Plus Expected Development on Reported Claims | 13,641 |  |  |  |  |  |  |
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | 95,799 | 86,851 | 75,964 | 67,605 | 54,619 | 41,481 | 17,865 |
International [Member] | Casualty Business [Member] | 2014 [Member] |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance | 158,117 | 166,605 | 166,576 | 168,865 | 187,451 | 195,753 |  |
Total of IBNR Liabilities Plus Expected Development on Reported Claims | 27,302 |  |  |  |  |  |  |
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | 99,522 | 86,607 | 73,955 | 62,508 | 44,805 | 25,910 |  |
International [Member] | Casualty Business [Member] | 2015 [Member] |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance | 167,290 | 172,061 | 172,811 | 179,392 | 193,714 |  |  |
Total of IBNR Liabilities Plus Expected Development on Reported Claims | 30,299 |  |  |  |  |  |  |
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | 96,180 | 82,465 | 69,674 | 48,806 | 24,237 |  |  |
International [Member] | Casualty Business [Member] | 2016 [Member] |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance | 178,255 | 177,979 | 180,284 | 184,267 |  |  |  |
Total of IBNR Liabilities Plus Expected Development on Reported Claims | 46,648 |  |  |  |  |  |  |
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | 87,191 | 70,108 | 50,824 | 26,446 |  |  |  |
International [Member] | Casualty Business [Member] | 2017 [Member] |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance | 150,276 | 139,214 | 191,492 |  |  |  |  |
Total of IBNR Liabilities Plus Expected Development on Reported Claims | 48,308 |  |  |  |  |  |  |
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | 77,614 | 52,774 | 26,541 |  |  |  |  |
International [Member] | Casualty Business [Member] | 2018 [Member] |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance | 319,752 | 309,673 |  |  |  |  |  |
Total of IBNR Liabilities Plus Expected Development on Reported Claims | 148,582 |  |  |  |  |  |  |
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | 97,222 | 57,962 |  |  |  |  |  |
International [Member] | Casualty Business [Member] | 2019 [Member] |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance | 291,237 |  |  |  |  |  |  |
Total of IBNR Liabilities Plus Expected Development on Reported Claims | 189,506 |  |  |  |  |  |  |
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | 52,808 |  |  |  |  |  |  |
International [Member] | Property Business [Member] |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance | 4,581,301 |  |  |  |  |  |  |
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | 3,209,811 |  |  |  |  |  |  |
All outstanding liabilities prior to 2012, net of reinsurance | 54,040 |  |  |  |  |  |  |
Liabilities for claims and claim adjustment expenses, net of reinsurance | 1,425,530 |  |  |  |  |  |  |
International [Member] | Property Business [Member] | 2012 [Member] |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance | 358,428 | 344,626 | 340,618 | 342,251 | 346,116 | 338,496 | 397,747 | 437,946
Total of IBNR Liabilities Plus Expected Development on Reported Claims | 754 |  |  |  |  |  |  |
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | 355,887 | 324,936 | 319,112 | 311,706 | 303,002 | 279,611 | 230,203 | 126,001
International [Member] | Property Business [Member] | 2013 [Member] |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance | 369,876 | 362,370 | 365,106 | 366,182 | 374,216 | 413,959 | 473,767 |
Total of IBNR Liabilities Plus Expected Development on Reported Claims | 920 |  |  |  |  |  |  |
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | 354,102 | 341,831 | 337,087 | 325,155 | 294,024 | 246,893 | 121,461 |
International [Member] | Property Business [Member] | 2014 [Member] |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance | 446,412 | 445,914 | 443,210 | 497,317 | 541,484 | 589,489 |  |
Total of IBNR Liabilities Plus Expected Development on Reported Claims | 3,613 |  |  |  |  |  |  |
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | 416,735 | 410,715 | 392,731 | 360,679 | 295,731 | 162,647 |  |
International [Member] | Property Business [Member] | 2015 [Member] |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance | 385,980 | 384,816 | 388,795 | 393,027 | 545,360 |  |  |
Total of IBNR Liabilities Plus Expected Development on Reported Claims | 4,466 |  |  |  |  |  |  |
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | 345,693 | 334,271 | 299,773 | 235,921 | 127,511 |  |  |
International [Member] | Property Business [Member] | 2016 [Member] |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance | 595,512 | 593,567 | 543,428 | 539,447 |  |  |  |
Total of IBNR Liabilities Plus Expected Development on Reported Claims | 15,930 |  |  |  |  |  |  |
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | 481,029 | 447,094 | 316,190 | 159,425 |  |  |  |
International [Member] | Property Business [Member] | 2017 [Member] |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance | 970,874 | 954,835 | 857,100 |  |  |  |  |
Total of IBNR Liabilities Plus Expected Development on Reported Claims | 15,997 |  |  |  |  |  |  |
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | 773,790 | 641,832 | 247,895 |  |  |  |  |
International [Member] | Property Business [Member] | 2018 [Member] |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance | 574,521 | 544,258 |  |  |  |  |  |
Total of IBNR Liabilities Plus Expected Development on Reported Claims | 84,717 |  |  |  |  |  |  |
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | 330,681 | 90,429 |  |  |  |  |  |
International [Member] | Property Business [Member] | 2019 [Member] |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance | 879,698 |  |  |  |  |  |  |
Total of IBNR Liabilities Plus Expected Development on Reported Claims | 389,242 |  |  |  |  |  |  |
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | 151,893 |  |  |  |  |  |  |
Bermuda Segment [Member] | Casualty Business [Member] |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance | 2,945,212 |  |  |  |  |  |  |
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | 991,242 |  |  |  |  |  |  |
All outstanding liabilities prior to 2012, net of reinsurance | 356,351 |  |  |  |  |  |  |
Liabilities for claims and claim adjustment expenses, net of reinsurance | 2,310,321 |  |  |  |  |  |  |
Bermuda Segment [Member] | Casualty Business [Member] | 2012 [Member] |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance | 241,631 | 241,312 | 237,315 | 236,883 | 230,441 | 240,949 | 262,122 | 284,509
Total of IBNR Liabilities Plus Expected Development on Reported Claims | 30,273 |  |  |  |  |  |  |
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | 164,775 | 149,629 | 130,159 | 102,019 | 75,680 | 51,278 | 29,660 | 12,864
Bermuda Segment [Member] | Casualty Business [Member] | 2013 [Member] |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance | 230,654 | 234,668 | 250,627 | 261,259 | 252,704 | 258,432 | 228,258 |
Total of IBNR Liabilities Plus Expected Development on Reported Claims | 33,689 |  |  |  |  |  |  |
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | 144,010 | 124,708 | 102,866 | 77,270 | 52,270 | 33,951 | 16,996 |
Bermuda Segment [Member] | Casualty Business [Member] | 2014 [Member] |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance | 226,434 | 234,196 | 257,904 | 261,523 | 244,163 | 211,439 |  |
Total of IBNR Liabilities Plus Expected Development on Reported Claims | 48,168 |  |  |  |  |  |  |
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | 115,098 | 91,981 | 67,716 | 42,872 | 24,915 | 13,580 |  |
Bermuda Segment [Member] | Casualty Business [Member] | 2015 [Member] |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance | 309,983 | 308,042 | 307,957 | 301,791 | 273,468 |  |  |
Total of IBNR Liabilities Plus Expected Development on Reported Claims | 82,925 |  |  |  |  |  |  |
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | 153,080 | 127,930 | 93,220 | 58,956 | 13,643 |  |  |
Bermuda Segment [Member] | Casualty Business [Member] | 2016 [Member] |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance | 357,169 | 349,522 | 351,182 | 292,353 |  |  |  |
Total of IBNR Liabilities Plus Expected Development on Reported Claims | 114,651 |  |  |  |  |  |  |
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | 155,397 | 121,553 | 84,152 | 45,671 |  |  |  |
Bermuda Segment [Member] | Casualty Business [Member] | 2017 [Member] |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance | 365,823 | 365,767 | 354,391 |  |  |  |  |
Total of IBNR Liabilities Plus Expected Development on Reported Claims | 181,139 |  |  |  |  |  |  |
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | 103,915 | 64,197 | 29,904 |  |  |  |  |
Bermuda Segment [Member] | Casualty Business [Member] | 2018 [Member] |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance | 546,367 | 547,267 |  |  |  |  |  |
Total of IBNR Liabilities Plus Expected Development on Reported Claims | 376,744 |  |  |  |  |  |  |
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | 93,727 | 36,678 |  |  |  |  |  |
Bermuda Segment [Member] | Casualty Business [Member] | 2019 [Member] |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance | 667,150 |  |  |  |  |  |  |
Total of IBNR Liabilities Plus Expected Development on Reported Claims | 551,529 |  |  |  |  |  |  |
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | 61,239 |  |  |  |  |  |  |
Bermuda Segment [Member] | Property Business [Member] |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance | 1,787,971 |  |  |  |  |  |  |
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | 1,150,003 |  |  |  |  |  |  |
All outstanding liabilities prior to 2012, net of reinsurance | 26,236 |  |  |  |  |  |  |
Liabilities for claims and claim adjustment expenses, net of reinsurance | 664,204 |  |  |  |  |  |  |
Bermuda Segment [Member] | Property Business [Member] | 2012 [Member] |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance | 120,824 | 117,734 | 118,999 | 117,909 | 117,221 | 119,168 | 180,775 | 238,152
Total of IBNR Liabilities Plus Expected Development on Reported Claims | 593 |  |  |  |  |  |  |
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | 116,429 | 113,816 | 113,508 | 111,772 | 108,172 | 90,147 | 85,175 | 45,573
Bermuda Segment [Member] | Property Business [Member] | 2013 [Member] |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance | 112,900 | 114,800 | 114,252 | 115,029 | 124,191 | 142,666 | 217,531 |
Total of IBNR Liabilities Plus Expected Development on Reported Claims | 272 |  |  |  |  |  |  |
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | 111,833 | 111,655 | 110,378 | 108,535 | 101,614 | 64,560 | 34,745 |
Bermuda Segment [Member] | Property Business [Member] | 2014 [Member] |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance | 136,813 | 137,389 | 134,776 | 138,381 | 164,139 | 186,492 |  |
Total of IBNR Liabilities Plus Expected Development on Reported Claims | 1,092 |  |  |  |  |  |  |
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | 131,455 | 129,891 | 126,552 | 106,564 | 86,611 | 32,813 |  |
Bermuda Segment [Member] | Property Business [Member] | 2015 [Member] |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance | 143,266 | 146,196 | 143,625 | 157,711 | 192,520 |  |  |
Total of IBNR Liabilities Plus Expected Development on Reported Claims | 2,204 |  |  |  |  |  |  |
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | 134,862 | 131,387 | 109,401 | 73,041 | 33,814 |  |  |
Bermuda Segment [Member] | Property Business [Member] | 2016 [Member] |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance | 187,607 | 186,735 | 181,593 | 206,279 |  |  |  |
Total of IBNR Liabilities Plus Expected Development on Reported Claims | 4,619 |  |  |  |  |  |  |
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | 167,562 | 130,319 | 78,499 | 26,737 |  |  |  |
Bermuda Segment [Member] | Property Business [Member] | 2017 [Member] |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance | 346,472 | 365,405 | 393,969 |  |  |  |  |
Total of IBNR Liabilities Plus Expected Development on Reported Claims | 10,115 |  |  |  |  |  |  |
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | 250,661 | 137,127 | 38,106 |  |  |  |  |
Bermuda Segment [Member] | Property Business [Member] | 2018 [Member] |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance | 396,488 | 394,542 |  |  |  |  |  |
Total of IBNR Liabilities Plus Expected Development on Reported Claims | 85,786 |  |  |  |  |  |  |
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | 170,831 | 72,580 |  |  |  |  |  |
Bermuda Segment [Member] | Property Business [Member] | 2019 [Member] |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance | 343,602 |  |  |  |  |  |  |
Total of IBNR Liabilities Plus Expected Development on Reported Claims | 184,640 |  |  |  |  |  |  |
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | 66,370 |  |  |  |  |  |  |
Insurance [Member] | Casualty Business [Member] |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance | 4,370,593 |  |  |  |  |  |  |
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | 2,193,224 |  |  |  |  |  |  |
All outstanding liabilities prior to 2012, net of reinsurance | 300,347 |  |  |  |  |  |  |
Liabilities for claims and claim adjustment expenses, net of reinsurance | 2,477,716 |  |  |  |  |  |  |
Insurance [Member] | Casualty Business [Member] | 2012 [Member] |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance | 351,320 | 346,882 | 343,931 | 353,320 | 348,180 | 346,953 | 351,402 | 349,597
Total of IBNR Liabilities Plus Expected Development on Reported Claims | $ 20,199 |  |  |  |  |  |  |
Cumulative Number of Reported Claims | 15,769 |  |  |  |  |  |  |
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | $ 306,833 | 294,380 | 272,055 | 246,407 | 213,451 | 157,897 | 101,288 | 33,185
Insurance [Member] | Casualty Business [Member] | 2013 [Member] |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance | 350,815 | 344,388 | 351,295 | 393,035 | 392,827 | 393,390 | 393,539 |
Total of IBNR Liabilities Plus Expected Development on Reported Claims | $ 23,120 |  |  |  |  |  |  |
Cumulative Number of Reported Claims | 21,350 |  |  |  |  |  |  |
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | $ 303,726 | 285,822 | 260,184 | 224,611 | 176,312 | 117,037 | 33,311 |
Insurance [Member] | Casualty Business [Member] | 2014 [Member] |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance | 397,834 | 397,061 | 460,642 | 454,576 | 457,043 | 431,068 |  |
Total of IBNR Liabilities Plus Expected Development on Reported Claims | $ 38,872 |  |  |  |  |  |  |
Cumulative Number of Reported Claims | 25,188 |  |  |  |  |  |  |
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | $ 325,856 | 297,644 | 256,807 | 201,646 | 124,915 | 41,190 |  |
Insurance [Member] | Casualty Business [Member] | 2015 [Member] |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance | 468,584 | 542,176 | 535,671 | 528,050 | 519,509 |  |  |
Total of IBNR Liabilities Plus Expected Development on Reported Claims | $ 54,740 |  |  |  |  |  |  |
Cumulative Number of Reported Claims | 26,896 |  |  |  |  |  |  |
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | $ 353,232 | 291,943 | 218,853 | 134,730 | 44,311 |  |  |
Insurance [Member] | Casualty Business [Member] | 2016 [Member] |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance | 615,168 | 580,323 | 551,321 | 553,437 |  |  |  |
Total of IBNR Liabilities Plus Expected Development on Reported Claims | $ 166,117 |  |  |  |  |  |  |
Cumulative Number of Reported Claims | 31,517 |  |  |  |  |  |  |
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | $ 342,325 | 268,909 | 164,225 | 54,731 |  |  |  |
Insurance [Member] | Casualty Business [Member] | 2017 [Member] |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance | 625,039 | 602,985 | 612,967 |  |  |  |  |
Total of IBNR Liabilities Plus Expected Development on Reported Claims | $ 226,898 |  |  |  |  |  |  |
Cumulative Number of Reported Claims | 34,701 |  |  |  |  |  |  |
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | $ 280,797 | 172,200 | 53,898 |  |  |  |  |
Insurance [Member] | Casualty Business [Member] | 2018 [Member] |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance | 711,001 | 705,789 |  |  |  |  |  |
Total of IBNR Liabilities Plus Expected Development on Reported Claims | $ 353,806 |  |  |  |  |  |  |
Cumulative Number of Reported Claims | 33,817 |  |  |  |  |  |  |
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | $ 208,081 | 63,492 |  |  |  |  |  |
Insurance [Member] | Casualty Business [Member] | 2019 [Member] |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance | 850,832 |  |  |  |  |  |  |
Total of IBNR Liabilities Plus Expected Development on Reported Claims | $ 653,255 |  |  |  |  |  |  |
Cumulative Number of Reported Claims | 30,144 |  |  |  |  |  |  |
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | $ 72,375 |  |  |  |  |  |  |
Insurance [Member] | Property Business [Member] |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance | 1,975,961 |  |  |  |  |  |  |
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | 1,773,329 |  |  |  |  |  |  |
All outstanding liabilities prior to 2012, net of reinsurance | 644 |  |  |  |  |  |  |
Liabilities for claims and claim adjustment expenses, net of reinsurance | 203,277 |  |  |  |  |  |  |
Insurance [Member] | Property Business [Member] | 2012 [Member] |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance | 82,526 | 81,979 | 81,802 | 82,019 | 82,448 | 81,747 | 89,000 | 106,325
Total of IBNR Liabilities Plus Expected Development on Reported Claims | 68 |  |  |  |  |  |  |
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | 82,457 | 81,820 | 81,682 | 81,891 | 81,749 | 80,469 | 81,772 | $ 56,504
Insurance [Member] | Property Business [Member] | 2013 [Member] |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance | 92,246 | 92,393 | 92,233 | 92,144 | 91,251 | 98,106 | 112,037 |
Total of IBNR Liabilities Plus Expected Development on Reported Claims | 471 |  |  |  |  |  |  |
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | 91,777 | 91,759 | 91,720 | 92,110 | 91,841 | 93,110 | $ 68,695 |
Insurance [Member] | Property Business [Member] | 2014 [Member] |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance | 119,413 | 119,282 | 119,464 | 119,928 | 123,668 | 131,679 |  |
Total of IBNR Liabilities Plus Expected Development on Reported Claims | 407 |  |  |  |  |  |  |
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | 118,660 | 118,545 | 118,211 | 118,220 | 116,037 | $ 81,827 |  |
Insurance [Member] | Property Business [Member] | 2015 [Member] |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance | 144,769 | 146,780 | 143,944 | 152,895 | 172,904 |  |  |
Total of IBNR Liabilities Plus Expected Development on Reported Claims | 405 |  |  |  |  |  |  |
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | 146,719 | 145,225 | 142,437 | 141,280 | $ 102,170 |  |  |
Insurance [Member] | Property Business [Member] | 2016 [Member] |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance | 291,672 | 280,170 | 275,154 | 290,264 |  |  |  |
Total of IBNR Liabilities Plus Expected Development on Reported Claims | 736 |  |  |  |  |  |  |
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | 289,194 | 271,938 | 249,517 | $ 162,548 |  |  |  |
Insurance [Member] | Property Business [Member] | 2017 [Member] |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance | 494,844 | 501,407 | 496,905 |  |  |  |  |
Total of IBNR Liabilities Plus Expected Development on Reported Claims | 13,043 |  |  |  |  |  |  |
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | 458,811 | 424,181 | $ 178,666 |  |  |  |  |
Insurance [Member] | Property Business [Member] | 2018 [Member] |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance | 401,900 | 407,855 |  |  |  |  |  |
Total of IBNR Liabilities Plus Expected Development on Reported Claims | 14,862 |  |  |  |  |  |  |
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | 358,324 | $ 244,772 |  |  |  |  |  |
Insurance [Member] | Property Business [Member] | 2019 [Member] |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance | 348,590 |  |  |  |  |  |  |
Total of IBNR Liabilities Plus Expected Development on Reported Claims | 81,655 |  |  |  |  |  |  |
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | $ 227,387 |  |  |  |  |  |  |

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