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EQUITY METHOD INVESTMENTS - (Details) - USD ($)
$ in Millions
Jun. 30, 2015
Dec. 31, 2014
Schedule of Equity Method Investments [Line Items]    
Estimate fair value of equity method investments $ 533.7 $ 534.7
Maritime Finance Company    
Schedule of Equity Method Investments [Line Items]    
Ownership percentage 31.00%  
Mineral Acquisition Company    
Schedule of Equity Method Investments [Line Items]    
Ownership percentage   70.00%