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SUBSEQUENT EVENTS (Details) - USD ($)
$ in Thousands
Apr. 16, 2018
Mar. 31, 2018
Dec. 31, 2017
Mar. 31, 2017
Dec. 31, 2016
Subsequent Event [Line Items]          
Reinsurance recoverable on unpaid losses, end of period   $ 2,986,247 $ 3,159,514 $ 2,029,031 $ 2,276,109
Subsequent Event          
Subsequent Event [Line Items]          
Reinsurance recoverable on unpaid losses, end of period $ 108,000