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Schedule III - Supplementary Insurance Information (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information [Line Items] |  |  |  |
Deferred Acquisition Costs |  | $ 1,263,870 | $ 901,841 | $ 790,708
Reserves for Losses and Loss Adjustment Expenses |  | 20,031,943 | 17,757,156 | 16,513,928
Unearned Premiums |  | 7,337,002 | 6,011,942 | 4,838,965
Net Premiums Earned |  | 9,678,077 | 8,082,298 | 6,991,935
Net Losses and Loss Adjustment Expenses Incurred |  | 5,027,517 | 4,584,803 | 4,689,599
Amortization of Deferred Acquisition Costs |  | 1,739,580 | 1,303,178 | 1,004,842
Other Operating Expenses | [1] | 1,128,175 | 998,595 | 875,176
Net Premiums Written |  | 11,077,189 | 9,018,337 | 7,437,716
Operating segments | Insurance |  |  |  |
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information [Line Items] |  |  |  |
Deferred Acquisition Costs |  | 301,398 | 378,265 | 254,833
Reserves for Losses and Loss Adjustment Expenses |  | 11,017,327 | 9,810,622 | 8,989,930
Unearned Premiums |  | 3,381,810 | 2,937,664 | 2,334,225
Net Premiums Earned |  | 4,559,335 | 3,626,468 | 2,871,420
Net Losses and Loss Adjustment Expenses Incurred |  | 2,782,945 | 2,344,365 | 2,092,453
Amortization of Deferred Acquisition Costs |  | 885,866 | 606,265 | 418,483
Other Operating Expenses | [1] | 665,472 | 558,906 | 489,153
Net Premiums Written |  | 5,020,642 | 4,148,193 | 3,162,907
Operating segments | Reinsurance |  |  |  |
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information [Line Items] |  |  |  |
Deferred Acquisition Costs |  | 992,339 | 424,390 | 278,422
Reserves for Losses and Loss Adjustment Expenses |  | 8,305,854 | 6,878,721 | 5,027,742
Unearned Premiums |  | 3,206,284 | 2,263,264 | 1,356,983
Net Premiums Earned |  | 3,959,381 | 2,840,443 | 2,162,229
Net Losses and Loss Adjustment Expenses Incurred |  | 2,568,843 | 1,924,719 | 1,628,320
Amortization of Deferred Acquisition Costs |  | 813,555 | 536,754 | 354,048
Other Operating Expenses | [1] | 267,531 | 212,810 | 168,011
Net Premiums Written |  | 4,923,976 | 3,254,374 | 2,457,370
Operating segments | Mortgage |  |  |  |
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information [Line Items] |  |  |  |
Deferred Acquisition Costs |  | (29,867) | 99,186 | 203,748
Reserves for Losses and Loss Adjustment Expenses |  | 708,762 | 1,067,813 | 976,673
Unearned Premiums |  | 748,908 | 811,014 | 740,043
Net Premiums Earned |  | 1,159,361 | 1,283,419 | 1,397,935
Net Losses and Loss Adjustment Expenses Incurred |  | (324,271) | 56,677 | 528,344
Amortization of Deferred Acquisition Costs |  | 40,159 | 97,418 | 134,240
Other Operating Expenses | [1] | 195,172 | 194,010 | 162,202
Net Premiums Written |  | 1,132,571 | 1,261,068 | 1,279,850
Operating segments | Other |  |  |  |
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information [Line Items] |  |  |  |
Deferred Acquisition Costs |  |  |  | 53,705
Reserves for Losses and Loss Adjustment Expenses |  |  |  | 1,519,583
Unearned Premiums |  |  |  | 407,714
Net Premiums Earned |  |  | 331,968 | 560,351
Net Losses and Loss Adjustment Expenses Incurred |  |  | 259,042 | 440,482
Amortization of Deferred Acquisition Costs |  |  | 62,741 | 98,071
Other Operating Expenses | [1] |  | 32,869 | 55,810
Net Premiums Written |  |  | $ 354,702 | $ 537,589
[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.

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