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DEBT - Debt Restrictions Narrative (Details) - USD ($)
$ in Millions
Dec. 31, 2015
Jul. 31, 2013
Debt Disclosure [Abstract]    
Restrictive covenants, minimum amount of cash and cash equivalents $ 50.0  
Line of Credit | Secured debt | $1.125 billion newbuild facility    
Debt Instrument [Line Items]    
Maximum borrowing capacity $ 1,125.0 $ 1,125.0