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UNAUDITED CONDENSED QUARTERLY FINANCIAL DATA (Details) - USD ($)
$ / shares in Units, $ 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
Effect of Fourth Quarter Events [Line Items]                      
Net premiums earned $ 1,087,368 $ 1,091,312 $ 1,104,003 $ 1,088,625 $ 1,172,051 $ 1,157,307 $ 1,123,607 $ 1,134,212 $ 4,371,309 $ 4,587,178 $ 4,791,495
Net investment income 109,503 101,956 45,040 93,101 117,557 115,763 137,949 107,303 349,601 478,572 438,507
Net investment gains (losses) 83,356 55,609 53,043 (62,877) 42,712 14,527 21,225 12,767 129,133 91,233 (150,218)
Underwriting income (loss) (80,835) (135,324) 87,412 (196,767) (49,254) (78,718) 78,659 77,822      
Net income (loss) available (attributable) to common shareholders $ (4,819) $ (72,945) $ 112,477 $ (185,390) $ (9,897) $ 27,745 $ 166,387 $ 98,125 $ (150,674) $ 282,361 $ 396
Earnings (loss) per common share (in dollars per share) $ (0.06) $ (0.87) $ 1.33 $ (2.20) $ (0.12) $ 0.33 $ 1.98 $ 1.17 $ (1.79) $ 3.37 $ 0
Earnings (loss) per diluted common share (in dollars per share) $ (0.06) $ (0.87) $ 1.33 $ (2.20) $ (0.12) $ 0.33 $ 1.97 $ 1.16 $ (1.79) $ 3.34 $ 0
General and administrative expenses                 $ 579,790 $ 634,831 $ 627,389
Transaction and reorganization expenses $ 7,000 $ 1,000 $ 400 $ (1,000) $ 8,000 $ 11,000 $ 3,000 $ 15,000      
Amortization of value of business acquired 1,000 1,000 1,000 2,000 2,000 4,000 7,000 13,000 5,139 26,722 172,332
Corporate                      
Effect of Fourth Quarter Events [Line Items]                      
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