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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, 2015 | Dec. 31, 2014
--- | --- | ---
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 | 132
Significant other observable inputs (Level 2) |  |
Assets |  |
Derivative instruments, at fair value | 349,152 | 458,460
Liabilities |  |
Derivative instruments, at fair value | 43,696 | 22,810
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 | 349,152 | 458,460
Liabilities |  |
Derivative instruments, at fair value | $ 43,696 | $ 22,942

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