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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
Supplementary Insurance Information [Line Items]      
Deferred acquisition costs $ 465,593 $ 431,439 $ 492,119
Reserve for losses and loss expenses 14,653,094 13,926,766 12,752,081
Unearned premiums 4,090,676 3,685,886 3,626,246
Net premiums earned 4,709,850 4,371,309 4,587,178
Net investment income 454,301 349,601 478,572
Net losses and loss expenses 3,008,783 3,281,252 3,044,798
Acquisition costs 921,834 929,517 1,024,582
Other operating expenses 663,304 579,790 634,831
Net premiums written 4,926,624 4,336,409 4,489,615
General and administrative expenses 663,304 579,790 634,831
Operating Segments      
Supplementary Insurance Information [Line Items]      
General and administrative expenses 536,834 477,968 505,735
Operating Segments | Insurance      
Supplementary Insurance Information [Line Items]      
Deferred acquisition costs 212,681 176,749 191,925
Reserve for losses and loss expenses 7,803,529 7,310,498 6,496,568
Unearned premiums 2,716,240 2,295,763 2,115,664
Net premiums earned 2,651,339 2,299,038 2,190,084
Net investment income 0 0 0
Net losses and loss expenses 1,514,998 1,697,014 1,278,679
Acquisition costs 484,344 461,533 468,281
Other operating expenses 429,282 378,839 401,963
Net premiums written 2,894,885 2,357,501 2,209,155
General and administrative expenses 429,282 378,839 401,963
Operating Segments | Reinsurance      
Supplementary Insurance Information [Line Items]      
Deferred acquisition costs 252,912 254,690 300,194
Reserve for losses and loss expenses 6,849,565 6,616,268 6,255,513
Unearned premiums 1,374,436 1,390,123 1,510,582
Net premiums earned 2,058,511 2,072,271 2,397,094
Net investment income 0 0 0
Net losses and loss expenses 1,493,785 1,584,238 1,766,119
Acquisition costs 437,490 467,984 556,301
Other operating expenses 107,552 99,129 103,772
Net premiums written 2,031,739 1,978,908 2,280,460
General and administrative expenses 107,552 99,129 103,772
Corporate      
Supplementary Insurance Information [Line Items]      
Deferred acquisition costs 0 0 0
Reserve for losses and loss expenses 0 0 0
Unearned premiums 0 0 0
Net premiums earned 0 0 0
Net investment income 454,301 349,601 478,572
Net losses and loss expenses 0 0 0
Acquisition costs 0 0 0
Other operating expenses 126,470 101,822 129,096
Net premiums written 0 0 0
General and administrative expenses $ 126,470 $ 101,822 $ 129,096