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OTHER COMPREHENSIVE INCOME (LOSS) (Reclassifications Out of AOCI Into Net Income (Loss) (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Reclassification out of accumulated comprehensive income into net income available to common shareholders [Line Items]      
Other investment gains (losses) $ (14,416) $ (18,497)  
OTTI losses (414) (6,553)  
Income before income taxes and interest in income (loss) of equity method investments 72,166 16,284  
Income tax (expense) benefit 1,036 9,337  
Net income available to common shareholders 62,546 5,014  
Foreign exchange losses (37,860) (21,465)  
Non-cash foreign exchange losses 0 24,149 $ 24,000
Unrealized investment gains (losses) on available for sale investments | Reclassification out of Accumulated Other Comprehensive Income      
Reclassification out of accumulated comprehensive income into net income available to common shareholders [Line Items]      
Other investment gains (losses) 4,526 (19,206)  
OTTI losses (414) (6,553)  
Income before income taxes and interest in income (loss) of equity method investments 4,112 (25,759)  
Income tax (expense) benefit (4,897) 791  
Net income available to common shareholders (785) (24,968)  
Foreign currency translation adjustment | Reclassification out of Accumulated Other Comprehensive Income      
Reclassification out of accumulated comprehensive income into net income available to common shareholders [Line Items]      
Income tax (expense) benefit 0 0  
Net income available to common shareholders 0 (24,149)  
Foreign exchange losses $ 0 $ (24,149)