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Schedule IV - Reinsurance (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]                      
Gross Amount                 $ 6,553,910 $ 5,681,523 $ 4,838,902
Ceded to other Companies                 (2,650,352) (2,099,893) (1,614,257)
Assumed From Other Companies                 3,534,158 2,457,437 2,122,102
Net Amount $ 1,758,015 $ 1,874,144 $ 1,668,311 $ 2,137,246 $ 1,455,453 $ 1,613,457 $ 1,444,898 $ 1,525,259 $ 7,437,716 $ 6,039,067 $ 5,346,747
Percentage of Amount Assumed to Net                 47.50% 40.70% 39.70%
Other                      
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]                      
Gross Amount                 $ 396,743 $ 339,169 $ 253,760
Ceded to other Companies [1]                 (190,957) (222,019) (130,840)
Assumed From Other Companies [1]                 331,803 415,712 481,255
Net Amount                 $ 537,589 $ 532,862 $ 604,175
Percentage of Amount Assumed to Net                 61.70% 78.00% 79.70%
Underwriting segments                      
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]                      
Ceded to other Companies                 $ (2,732,564) $ (2,189,440) $ (1,791,851)
Net Amount                 6,900,127 5,506,205 4,742,572
Underwriting segments | Insurance                      
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]                      
Gross Amount                 4,659,416 3,879,752 3,232,234
Ceded to other Companies [1]                 (1,525,655) (1,266,267) (1,050,207)
Assumed From Other Companies [1]                 29,146 28,241 30,098
Net Amount                 $ 3,162,907 $ 2,641,726 $ 2,212,125
Percentage of Amount Assumed to Net                 0.90% 1.10% 1.40%
Underwriting segments | Reinsurance                      
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]                      
Gross Amount                 $ 305,435 $ 238,229 $ 213,809
Ceded to other Companies [1]                 (1,014,716) (720,500) (539,950)
Assumed From Other Companies [1]                 3,166,651 2,084,994 1,698,713
Net Amount                 $ 2,457,370 $ 1,602,723 $ 1,372,572
Percentage of Amount Assumed to Net                 128.90% 130.10% 123.80%
Underwriting segments | Mortgage                      
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]                      
Gross Amount                 $ 1,192,316 $ 1,224,373 $ 1,139,099
Ceded to other Companies [1]                 (194,149) (204,509) (202,833)
Assumed From Other Companies [1]                 281,683 241,892 221,609
Net Amount                 $ 1,279,850 $ 1,261,756 $ 1,157,875
Percentage of Amount Assumed to Net                 22.00% 19.20% 19.10%
[1] Certain amounts included in the gross premiums written of each segment are related to intersegment transactions and are included in the gross premiums written of each segment. Accordingly, the sum of gross premiums written for each segment does not agree to the total gross premiums written as shown in the table above due to the elimination of intersegment transactions in the total.