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SCHEDULE III - SUPPLEMENTARY INSURANCE INFORMATION (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Supplementary Insurance Information [Line Items]      
Deferred acquisition costs $ 492,119 $ 566,622 $ 474,061
Reserve for losses and loss expenses 12,752,081 12,280,769 12,997,553
Unearned premiums 3,626,246 3,635,758 3,641,399
Net premiums earned 4,587,178 4,791,495 4,148,760
Net investment income 478,572 438,507 400,805
Net losses and loss expenses 3,044,798 3,190,287 3,287,772
Acquisition costs 1,024,582 968,835 823,591
Other operating expenses 634,831 627,389 579,428
Net premiums written 4,489,615 4,658,962 4,027,143
General and administrative expenses 634,831 627,389 579,428
Operating Segments      
Supplementary Insurance Information [Line Items]      
General and administrative expenses 505,735 519,168 449,483
Operating Segments | Insurance      
Supplementary Insurance Information [Line Items]      
Deferred acquisition costs 191,925 209,622 115,332
Reserve for losses and loss expenses 6,496,568 6,426,309 7,011,805
Unearned premiums 2,115,664 2,061,123 2,053,422
Net premiums earned 2,190,084 2,362,606 1,816,438
Net investment income 0 0 0
Net losses and loss expenses 1,278,679 1,494,323 1,465,427
Acquisition costs 468,281 399,193 270,229
Other operating expenses 401,963 395,252 325,368
Net premiums written 2,209,155 2,324,747 1,775,825
General and administrative expenses 401,963 395,252 325,368
Operating Segments | Reinsurance      
Supplementary Insurance Information [Line Items]      
Deferred acquisition costs 300,194 357,000 358,729
Reserve for losses and loss expenses 6,255,513 5,854,460 5,985,748
Unearned premiums 1,510,582 1,574,635 1,587,977
Net premiums earned 2,397,094 2,428,889 2,332,322
Net investment income 0 0 0
Net losses and loss expenses 1,766,119 1,695,964 1,822,345
Acquisition costs 556,301 569,642 553,362
Other operating expenses 103,772 123,916 124,115
Net premiums written 2,280,460 2,334,215 2,251,318
General and administrative expenses 103,772 123,916 124,115
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 478,572 438,507 400,805
Net losses and loss expenses 0 0 0
Acquisition costs 0 0 0
Other operating expenses 129,096 108,221 129,945
Net premiums written 0 0 0
General and administrative expenses $ 129,096 $ 108,221 $ 129,945