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Schedule III - Supplementary Insurance Information (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information [Line Items]      
Deferred Acquisition Costs $ 901,841 $ 790,708 $ 633,400
Reserves for Losses and Loss Adjustment Expenses 17,757,156 16,513,928 13,891,842
Unearned Premiums 6,011,942 4,838,965 4,339,549
Net Premiums Earned 8,082,298 6,991,935 5,786,498
Net Losses and Loss Adjustment Expenses Incurred 4,584,803 4,689,599 3,133,452
Amortization of Deferred Acquisition Costs 1,303,178 1,004,842 840,945
Other Operating Expenses [1] 998,595 875,176 800,997
Net Premiums Written 9,018,337 7,437,716 6,039,067
Operating segments | Insurance      
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information [Line Items]      
Deferred Acquisition Costs 378,265 254,833 188,684
Reserves for Losses and Loss Adjustment Expenses 9,810,622 8,989,930 7,900,328
Unearned Premiums 2,937,664 2,334,225 1,991,496
Net Premiums Earned 3,626,468 2,871,420 2,397,080
Net Losses and Loss Adjustment Expenses Incurred 2,344,365 2,092,453 1,615,475
Amortization of Deferred Acquisition Costs 606,265 418,483 361,614
Other Operating Expenses [1] 558,906 489,153 454,770
Net Premiums Written 4,148,193 3,162,907 2,641,726
Operating segments | Reinsurance      
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information [Line Items]      
Deferred Acquisition Costs 424,390 278,422 197,856
Reserves for Losses and Loss Adjustment Expenses 6,878,721 5,027,742 4,270,013
Unearned Premiums 2,263,264 1,356,983 971,776
Net Premiums Earned 2,840,443 2,162,229 1,466,389
Net Losses and Loss Adjustment Expenses Incurred 1,924,719 1,628,320 1,011,329
Amortization of Deferred Acquisition Costs 536,754 354,048 239,032
Other Operating Expenses [1] 212,810 168,011 141,484
Net Premiums Written 3,254,374 2,457,370 1,602,723
Operating segments | Mortgage      
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information [Line Items]      
Deferred Acquisition Costs 99,186 203,748 182,816
Reserves for Losses and Loss Adjustment Expenses 1,067,813 976,673 457,872
Unearned Premiums 811,014 740,043 937,370
Net Premiums Earned 1,283,419 1,397,935 1,366,340
Net Losses and Loss Adjustment Expenses Incurred 56,677 528,344 53,513
Amortization of Deferred Acquisition Costs 97,418 134,240 134,319
Other Operating Expenses [1] 194,010 162,202 153,092
Net Premiums Written 1,261,068 1,279,850 1,261,756
Operating segments | Other      
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information [Line Items]      
Deferred Acquisition Costs 53,705 64,044
Reserves for Losses and Loss Adjustment Expenses 1,519,583 1,263,629
Unearned Premiums 407,714 438,907
Net Premiums Earned 331,968 560,351 556,689
Net Losses and Loss Adjustment Expenses Incurred 259,042 440,482 453,135
Amortization of Deferred Acquisition Costs 62,741 98,071 105,980
Other Operating Expenses [1] 32,869 55,810 51,651
Net Premiums Written $ 354,702 $ 537,589 $ 532,862
[1] Certain other operating expenses relate to the Company’s corporate segment. Such amounts are not reflected in the table above. See note 4, “Segment Information,” to our consolidated financial statements in Item 8 for information related to the corporate segment.