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DERIVATIVE CONTRACTS AND COLLATERALIZED INDEBTEDNESS - Location of Assets and Liabilities Within the Consolidated Balance Sheets (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Apr. 30, 2018
Dec. 31, 2017
Derivatives, Fair Value [Line Items]        
Number Of Shares Monetized 16,139,868      
Derivative Instruments, Fair Value [Abstract]        
Collateralized Indebtedness Settled $ (516,537)      
Payments for (Proceeds from) Derivative Instrument, Financing Activities (24)      
Derivative Contracts Settled 0      
Net Cash Receipt Payment on Collateralized Indebtedness Settlement (516,513) $ (654,989)    
Proceeds from Issuance of Secured Debt 516,513 $ 662,724    
Not Designated as Hedging Instruments        
Derivative Instruments, Fair Value [Abstract]        
Asset Derivatives 34,779     $ 52,545
Liability Derivatives (153,850)     (239,951)
Interest Rate Swap, Conversion, Incremental Term Loan Facility [Member] [Domain] [Domain] | Not Designated as Hedging Instruments        
Derivatives, Fair Value [Line Items]        
Derivative, fixed interest rate     0.226%  
Prepaid forward contracts | Not Designated as Hedging Instruments | Current derivative contracts        
Derivative Instruments, Fair Value [Abstract]        
Asset Derivatives 0     52,545
Liability Derivatives 0     (52,545)
Prepaid forward contracts | Not Designated as Hedging Instruments | Long-term derivative contracts        
Derivative Instruments, Fair Value [Abstract]        
Asset Derivatives 31,510     0
Liability Derivatives (10,131)     (109,504)
Interest Rate Swap | Not Designated as Hedging Instruments | Current derivative contracts        
Derivative Instruments, Fair Value [Abstract]        
Asset Derivatives 3,269     0
Interest Rate Swap | Not Designated as Hedging Instruments | Long-term liabilities under derivative contracts        
Derivative Instruments, Fair Value [Abstract]        
Liability Derivatives $ (143,719)     $ (77,902)