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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)

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