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Reserve for Losses and Loss Adjustment Expenses (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Liability for Unpaid Claims and Claims Adjustment Expense, Period Increase (Decrease) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Minimum period for claims resolution |  |  |  |  |  |  |  |  | 5 years |  |  |
Summary of reserve for losses and loss adjustment expenses |  |  |  |  |  |  |  |  |  |  |  |
Balance, beginning of year |  |  |  | $ 2,058,266 |  |  |  | $ 2,072,822 | $ 2,058,266 | $ 2,072,822 | $ 2,054,994 |
Receivable from reinsurers on unpaid losses and loss adjustment expenses | $ 249,350 |  |  |  | $ 237,966 |  |  |  | 249,350 | 237,966 | 247,518 | $ 191,645
Net balance, beginning of year |  |  |  | 1,820,300 |  |  |  | 1,825,304 | 1,820,300 | 1,825,304 | 1,863,349 |
Net reserves acquired from acquisitions |  |  |  |  |  |  |  |  | 0 | 139,549 | 126,007 |
Net losses: |  |  |  |  |  |  |  |  |  |  |  |
Current year | 149,157 | $ 145,027 | $ 139,057 | 138,654 | 124,271 | $ 142,124 | $ 141,126 | 137,647 | 571,891 | 545,168 | 447,510 |
Favorable development of reserves established in prior years, net | (56,330) | $ (36,221) | $ (35,115) | $ (33,514) | (48,830) | $ (42,902) | $ (42,213) | $ (48,139) | (161,180) | (182,084) | (222,749) |
Total |  |  |  |  |  |  |  |  | 410,711 | 363,084 | 224,761 |
Paid related to: |  |  |  |  |  |  |  |  |  |  |  |
Current year |  |  |  |  |  |  |  |  | (84,186) | (93,737) | (43,616) |
Prior years |  |  |  |  |  |  |  |  | (390,849) | (413,900) | (345,197) |
Total paid |  |  |  |  |  |  |  |  | (475,035) | (507,637) | (388,813) |
Net balance, end of year | 1,755,976 |  |  |  | 1,820,300 |  |  |  | 1,755,976 | 1,820,300 | 1,825,304 |
Balance, end of year | $ 2,005,326 |  |  |  | $ 2,058,266 |  |  |  | $ 2,005,326 | $ 2,058,266 | $ 2,072,822 |
Liability for unpaid claims and claims adjustment expense incurred claims prior years accident years |  |  |  |  |  |  |  |  | 2008 through 2012 | 2007 through 2011 | 2005 through 2011 |

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- Definition Accident years associated with net loss development. + References No definition available. + Details
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- Definition Minimum Period For Claims Resolution + References No definition available. + Details
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- Definition The amount needed to reflect the estimated ultimate cost of settling claims relating to insured events that have occurred on or before the balance sheet date, whether or not reported to the insurer at that date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (a),(b),(c) -URI http://asc.fasb.org/extlink&oid=6482485&loc=d3e14764-158437 + Details
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- Definition Amount of increase (decrease) in the cost of settling unpaid claims after deduction of reinsurance recoveries related to the acquisition of a business. Includes, but is not limited to, claims which have been incurred but not reported. + References No definition available. + Details
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- Definition Amount of payments to settle claims incurred in the current period and related claims settlement costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6482485&loc=d3e14764-158437 + Details
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- Definition Amount of payments to settle claims incurred in prior periods and related claims settlement costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6482485&loc=d3e14764-158437 + Details
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- Definition Amount of expense for claims incurred and costs incurred in the claim settlement process. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6482485&loc=d3e14764-158437 + Details
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- Definition Liability as of the balance sheet date for amounts representing estimated cost of settling unpaid claims under the terms of the underlying insurance policies, less estimated reinsurance recoveries on such claims. This includes an estimate for claims which have been incurred but not reported. Claim adjustment expenses represent the costs estimated to be incurred in the settlement of unpaid claims. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6482485&loc=d3e14764-158437 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 13 -Subparagraph a -Article 7 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Financial Reporting Release (FRR) -Number 403 -Paragraph 04 -Subparagraph b + Details
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- Definition Amount of payments to settle insured claims and pay costs incurred in the claims settlement process. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3536-108585 + Details
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- Definition Amount after valuation allowance of reinsurance recoverables for losses reported to the ceding insurer but not yet paid, amounts expected of incurred losses and settlement expenses, which have not yet been reported to the ceding insurer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 310 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6485522&loc=d3e21412-158489 + Details
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- Definition Amount of expense for claims incurred in the current reporting period and related claims settlement costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 235 -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-18) -URI http://asc.fasb.org/extlink&oid=34713774&loc=d3e575016-122915 + Details
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- Definition Amount of expense (reversal of expense) for claims incurred in prior reporting periods and related claims settlement costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 235 -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-18) -URI http://asc.fasb.org/extlink&oid=34713774&loc=d3e575016-122915 + Details
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