Quarterly report pursuant to Section 13 or 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 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Other-than-temporary impairment (OTTI) on securities $ 12,631 $ 5,115 $ 19,301 $ 7,227
Total reclassifications 21,362 (16,142) 57,259 (15,023)
Accumulated Net Investment Gain (Loss) Including Portion Attributable to Noncontrolling Interest | Reclassification out of Accumulated Other Comprehensive Income        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Gain (loss) on settlement of investments, net (8,731) 21,257 (37,958) 22,250
Other-than-temporary impairment (OTTI) on securities $ 12,631 $ 5,115 $ 19,301 $ 7,227