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SCHEDULE III - SUPPLEMENTARY INSURANCE INFORMATION (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Supplementary Insurance Information [Line Items]                      
Deferred acquisition costs $ 431,439       $ 492,119       $ 431,439 $ 492,119 $ 566,622
Reserve for losses and loss expenses 13,926,766       12,752,081       13,926,766 12,752,081 12,280,769
Unearned premiums 3,685,886       3,626,246       3,685,886 3,626,246 3,635,758
Net premiums earned                 4,371,309 4,587,178 4,791,495
Net investment income                 349,601 478,572 438,507
Net losses and loss expenses                 3,281,252 3,044,798 3,190,287
Acquisition costs                 929,517 1,024,582 968,835
Other operating expenses                 579,790 634,831 627,389
Net premiums written                 4,336,409 4,489,615 4,658,962
General and administrative expenses                 579,790 634,831 627,389
Operating Segments                      
Supplementary Insurance Information [Line Items]                      
General and administrative expenses                 477,968 505,735 519,168
Operating Segments | Insurance                      
Supplementary Insurance Information [Line Items]                      
Deferred acquisition costs 176,749       191,925       176,749 191,925 209,622
Reserve for losses and loss expenses 7,310,498       6,496,568       7,310,498 6,496,568 6,426,309
Unearned premiums 2,295,763       2,115,664       2,295,763 2,115,664 2,061,123
Net premiums earned                 2,299,038 2,190,084 2,362,606
Net investment income                 0 0 0
Net losses and loss expenses                 1,697,014 1,278,679 1,494,323
Acquisition costs                 461,533 468,281 399,193
Other operating expenses                 378,839 401,963 395,252
Net premiums written                 2,357,501 2,209,155 2,324,747
General and administrative expenses                 378,839 401,963 395,252
Operating Segments | Reinsurance                      
Supplementary Insurance Information [Line Items]                      
Deferred acquisition costs 254,690       300,194       254,690 300,194 357,000
Reserve for losses and loss expenses 6,616,268       6,255,513       6,616,268 6,255,513 5,854,460
Unearned premiums 1,390,123       1,510,582       1,390,123 1,510,582 1,574,635
Net premiums earned                 2,072,271 2,397,094 2,428,889
Net investment income                 0 0 0
Net losses and loss expenses                 1,584,238 1,766,119 1,695,964
Acquisition costs                 467,984 556,301 569,642
Other operating expenses                 99,129 103,772 123,916
Net premiums written                 1,978,908 2,280,460 2,334,215
General and administrative expenses                 99,129 103,772 123,916
Corporate                      
Supplementary Insurance Information [Line Items]                      
Deferred acquisition costs 0       0       0 0 0
Reserve for losses and loss expenses 0       0       0 0 0
Unearned premiums 0       0       0 0 0
Net premiums earned                 0 0 0
Net investment income                 349,601 478,572 438,507
Net losses and loss expenses                 0 0 0
Acquisition costs                 0 0 0
Other operating expenses                 101,822 129,096 108,221
Net premiums written                 0 0 0
General and administrative expenses $ 27,000 $ 21,000 $ 27,000 $ 27,000 $ 32,000 $ 29,000 $ 32,000 $ 36,000 $ 101,822 $ 129,096 $ 108,221