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INVESTMENTS (Details 6) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Schedule of Equity Method Investments [Line Items]      
Payments to acquire equity method investments $ 1,000 $ 0  
Equity method investments 111,233   $ 116,000
Harrington Reinsurance Holdings Limited [Member]      
Schedule of Equity Method Investments [Line Items]      
Payments to acquire equity method investments     $ 108,000
Equity method investment, ownership percentage     19.00%
Equity method investment, difference between carrying amount and underlying equity     $ 5,000
Other Equity Method Investments [Member]      
Schedule of Equity Method Investments [Line Items]      
Equity Method Investment, Other than Temporary Impairment 6,000    
Equity method investments $ 3,000   $ 9,000