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DERIVATIVE CONTRACTS AND COLLATERALIZED INDEBTEDNESS - Location of Assets and Liabilities Within the Consolidated Balance Sheets (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Apr. 30, 2018
Dec. 31, 2017
Derivatives, Fair Value [Line Items]        
Number Of Shares Monetized 10,802,118      
Derivative Instruments, Fair Value [Abstract]        
Collateralized Indebtedness Settled $ (337,148)      
Payments for (Proceeds from) Derivative Instrument, Financing Activities (24)      
Derivative Contracts Settled 0      
Proceeds from Issuance of Secured Debt (337,124) $ (490,816)    
Net Cash Receipt Payment on Collateralized Indebtedness Settlement 337,124 $ 483,081    
Not Designated as Hedging Instruments        
Derivative Instruments, Fair Value [Abstract]        
Asset Derivatives 110,999     $ 52,545
Liability Derivatives (133,093)     (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 9,623     52,545
Liability Derivatives (9,623)     (52,545)
Prepaid forward contracts | Not Designated as Hedging Instruments | Long-term derivative contracts        
Derivative Instruments, Fair Value [Abstract]        
Asset Derivatives 101,007     0
Liability Derivatives 0     (109,504)
Interest Rate Swap | Not Designated as Hedging Instruments | Current derivative contracts        
Derivative Instruments, Fair Value [Abstract]        
Asset Derivatives 369     0
Interest Rate Swap | Not Designated as Hedging Instruments | Long-term liabilities under derivative contracts        
Derivative Instruments, Fair Value [Abstract]        
Liability Derivatives $ (123,470)     $ (77,902)