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RESTRICTED CASH (Details 2) - USD ($)
$ in Millions
Dec. 31, 2016
Dec. 31, 2015
Restricted Cash and Cash Equivalents Items [Line Items]    
Debt Instrument, Covenant Compliance, Cash Required To Be Maintained $ 49.6 $ 40.3
Ship Finance International Limited [Member]    
Restricted Cash and Cash Equivalents Items [Line Items]    
Cash surplus required for vessel leasing agreements $ 26.0 $ 28.0