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Fair Value Measurements - Derivative Instrument Assets and Liabilities Measured at Fair Value (Details) - Fair value on a recurring basis - USD ($) $ in Thousands | Jun. 30, 2016 | Dec. 31, 2015
--- | --- | ---
Quoted prices in active markets for identical assets (Level 1) |  |
Assets |  |
Derivative instruments, at fair value | $ 0 | $ 0
Liabilities |  |
Derivative instruments, at fair value | 0 | 0
Significant other observable inputs (Level 2) |  |
Assets |  |
Derivative instruments, at fair value | 136,591 | 417,397
Liabilities |  |
Derivative instruments, at fair value | 110,960 | 23,434
Significant unobservable inputs (Level 3) |  |
Assets |  |
Derivative instruments, at fair value | 0 | 0
Liabilities |  |
Derivative instruments, at fair value | 0 | 0
Fair value |  |
Assets |  |
Derivative instruments, at fair value | 136,591 | 417,397
Liabilities |  |
Derivative instruments, at fair value | $ 110,960 | $ 23,434

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