Annual report pursuant to Section 13 and 15(d)

RECLASSIFICATION FROM ACCUMULATED OTHER COMPREHENSIVE INCOME INTO NET INCOME (Details)

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RECLASSIFICATION FROM ACCUMULATED OTHER COMPREHENSIVE INCOME INTO NET INCOME (Details) - USD ($)
$ 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
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]                      
Other-than-temporary impairment (OTTI) on securities $ (3,232) $ (5,567) $ (8,859) $ (7,516) $ (6,827) $ (3,889) $ (12,631) $ (6,670) $ (25,174) $ (30,017) $ (10,334)
Net income (loss) $ 230,381 $ 244,660 $ (25,020) $ 155,912 $ 8,854 $ 195,477 $ 185,836 $ 614,364 605,933 1,004,531 1,014,652
Allocation of income tax expense to other comprehensive income                 4,200    
Reclassification out of Accumulated Other Comprehensive Income                      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]                      
Net income (loss)                 (180,815) 59,953 (10,308)
Reclassification out of Accumulated Other Comprehensive Income | Accumulated Net Investment Gain (Loss) Including Portion Attributable to Noncontrolling Interest                      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]                      
Gain (loss) on settlement of investments, net                 (205,989) 29,936 (20,642)
Other-than-temporary impairment (OTTI) on securities                 $ 25,174 $ 30,017 $ 10,334