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UNAUDITED CONDENSED QUARTERLY FINANCIAL DATA (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract]                      
Net premiums earned $ 1,172,051 $ 1,157,307 $ 1,123,607 $ 1,134,212 $ 1,214,469 $ 1,224,075 $ 1,185,548 $ 1,167,402 $ 4,587,178 $ 4,791,495 $ 4,148,760
Net investment income 117,557 115,763 137,949 107,303 113,128 114,421 109,960 100,999 478,572 438,507 400,805
Net investment gains 42,712 14,527 21,225 12,767 (72,667) (17,628) (45,093) (14,830) 91,233 (150,218) 28,226
Underwriting income (loss) (49,254) (78,718) 78,659 77,822 (194,664) 59,026 115,726 143,737      
Net income (loss) available (attributable) to common shareholders $ (9,897) $ 27,745 $ 166,387 $ 98,125 $ (198,448) $ 43,439 $ 92,858 $ 62,546 $ 282,361 $ 396 $ (415,779)
Earnings (loss) per common share (in dollars per share) $ (0.12) $ 0.33 $ 1.98 $ 1.17 $ (2.37) $ 0.52 $ 1.11 $ 0.75 $ 3.37 $ 0 $ (4.94)
Earnings (loss) per diluted common share (in dollars per share) $ (0.12) $ 0.33 $ 1.97 $ 1.16 $ (2.37) $ 0.52 $ 1.11 $ 0.75 $ 3.34 $ 0 $ (4.94)
Transaction and reorganization expenses $ 8,000 $ 11,000 $ 3,000 $ 15,000 $ 19,000 $ 16,000 $ 19,000 $ 13,000      
Amortization of value of business acquired $ 2,000 $ 4,000 $ 7,000 $ 13,000 $ 23,000 $ 39,000 $ 53,000 $ 57,000 $ 26,722 $ 172,332 $ 50,104
Effect of Fourth Quarter Events [Line Items]                      
General and administrative expenses                 634,831 627,389 579,428
Corporate                      
Effect of Fourth Quarter Events [Line Items]                      
General and administrative expenses                 $ 129,096 $ 108,221 $ 129,945