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Derivative Instruments - Impact of Netting Agreements and Margin Deposits (Details) - USD ($) $ in Thousands | Jun. 30, 2015 | Dec. 31, 2014
--- | --- | ---
Asset derivatives: |  |
Derivative instruments, at fair value | $ 349,152 | $ 458,460
Liability derivatives: |  |
Derivative instruments, at fair value | 43,696 | 22,942
Commodity Derivatives |  |
Asset derivatives: |  |
Derivative instruments, at fair value | 349,152 | 458,460
Derivative instruments subject to master netting agreements | (27,724) | (22,810)
Margin deposits remitted to counterparties | 0 | 0
Derivative instruments, net | 321,428 | 435,650
Liability derivatives: |  |
Derivative instruments, at fair value | 43,696 | 22,942
Derivative instruments subject to master netting agreements | (27,724) | (22,810)
Margin deposits remitted to counterparties | 0 | (132)
Derivative instruments, net | $ 15,972 | $ 0

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