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Schedule III - Supplementary Insurance Information (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information [Line Items]      
Deferred Acquisition Costs $ 790,708 $ 633,400 $ 569,574
Reserves for Losses and Loss Adjustment Expenses 16,513,928 13,891,842 11,853,297
Unearned Premiums 4,838,965 4,339,549 3,753,636
Net Premiums Earned 6,991,935 5,786,498 5,231,975
Net Losses and Loss Adjustment Expenses Incurred 4,689,599 3,133,452 2,890,106
Amortization of Deferred Acquisition Costs 1,004,842 840,945 805,135
Other Operating Expenses [1] 875,176 800,997 677,809
Net Premiums Written 7,437,716 6,039,067 5,346,747
Other      
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information [Line Items]      
Deferred Acquisition Costs 53,705 64,044 80,858
Reserves for Losses and Loss Adjustment Expenses 1,519,583 1,263,629 1,032,760
Unearned Premiums 407,714 438,907 390,114
Net Premiums Earned 560,351 556,689 578,862
Net Losses and Loss Adjustment Expenses Incurred 440,482 453,135 441,255
Amortization of Deferred Acquisition Costs 98,071 105,980 125,558
Other Operating Expenses [1] 55,810 51,651 37,889
Net Premiums Written 537,589 532,862 604,175
Underwriting segments | Insurance      
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information [Line Items]      
Deferred Acquisition Costs 254,833 188,684 152,360
Reserves for Losses and Loss Adjustment Expenses 8,989,930 7,900,328 7,093,018
Unearned Premiums 2,334,225 1,991,496 1,549,183
Net Premiums Earned 2,871,420 2,397,080 2,205,661
Net Losses and Loss Adjustment Expenses Incurred 2,092,453 1,615,475 1,520,680
Amortization of Deferred Acquisition Costs 418,483 361,614 349,702
Other Operating Expenses [1] 489,153 454,770 364,138
Net Premiums Written 3,162,907 2,641,726 2,212,125
Underwriting segments | Reinsurance      
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information [Line Items]      
Deferred Acquisition Costs 278,422 197,856 166,276
Reserves for Losses and Loss Adjustment Expenses 5,027,742 4,270,013 3,215,909
Unearned Premiums 1,356,983 971,776 710,774
Net Premiums Earned 2,162,229 1,466,389 1,261,216
Net Losses and Loss Adjustment Expenses Incurred 1,628,320 1,011,329 846,882
Amortization of Deferred Acquisition Costs 354,048 239,032 211,280
Other Operating Expenses [1] 168,011 141,484 133,350
Net Premiums Written 2,457,370 1,602,723 1,372,572
Underwriting segments | Mortgage      
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information [Line Items]      
Deferred Acquisition Costs 203,748 182,816 170,080
Reserves for Losses and Loss Adjustment Expenses 976,673 457,872 511,610
Unearned Premiums 740,043 937,370 1,103,565
Net Premiums Earned 1,397,935 1,366,340 1,186,236
Net Losses and Loss Adjustment Expenses Incurred 528,344 53,513 81,289
Amortization of Deferred Acquisition Costs 134,240 134,319 118,595
Other Operating Expenses [1] 162,202 153,092 142,432
Net Premiums Written $ 1,279,850 $ 1,261,756 $ 1,157,875
[1] Certain other operating expenses relate to the Company’s corporate segment (non-underwriting). 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.