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UNAUDITED CONDENSED QUARTERLY FINANCIAL DATA (Details) - USD ($)
 3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Quarterly Financial Information Disclosure [Abstract]                      
Net premiums earned $ 1,211,495,000 $ 1,017,131,000 $ 981,431,000 $ 938,703,000 $ 921,879,000 $ 934,415,000 $ 946,990,000 $ 902,340,000 $ 4,148,760,000 $ 3,705,625,000 $ 3,686,417,000
Net investment income 100,908,000 95,169,000 106,063,000 98,664,000 95,517,000 116,923,000 91,730,000 49,164,000 400,805,000 353,335,000 305,336,000
Net realized investment gains (losses) 43,038,000 14,632,000 (4,392,000) (25,050,000) (20,229,000) 5,205,000 21,010,000 (66,508,000) 28,226,000 (60,525,000) (138,491,000)
Underwriting income (loss) 26,130,000 (512,853,000) 57,012,000 16,385,000 66,265,000 103,998,000 9,860,000 98,951,000      
Net income (loss) available to common shareholders $ (38,081,000) $ (467,740,000) $ 85,030,000 $ 5,014,000 $ 130,912,000 $ 176,644,000 $ 119,491,000 $ 38,417,000 $ (415,779,000) $ 465,462,000 $ 601,562,000
Basic earnings per common share (in dollars per share) $ (0.46) $ (5.61) $ 1.01 $ 0.06 $ 1.50 $ 1.97 $ 1.30 $ 0.41 $ (4.94) $ 5.13 $ 6.10
Diluted earnings per common share (in dollars per share) $ (0.46) $ (5.61) $ 1.01 $ 0.06 $ 1.48 $ 1.96 $ 1.29 $ 0.41 $ (4.94) $ 5.08 $ 6.04
Transaction and reorganization expenses $ 21,000,000 $ 6,000,000             $ 27,000,000 $ 0 $ 0
Deferred tax asset, provisional income tax expense 42,000,000               41,600,000    
Amortization of value of business acquired $ 50,000,000               $ 50,104,000 $ 0 $ 0