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Derivative Instruments (Tables) | 6 Months Ended
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Jun. 30, 2016
Derivative Instruments and Hedging Activities Disclosure [Abstract] |
Derivatives designated and not designated as hedging instruments | Settlements of derivative commodity instruments are reported as a component of cash flows from operations in the accompanying Statements of Condensed Consolidated Cash Flows.
| Three Months Ended June 30, |  | Six Months Ended June 30,
| 2016 |  | 2015 |  | 2016 |  | 2015
| (Thousands)
Commodity derivatives designated as cash flow hedges |
Amount of gain reclassified from accumulated OCI, net of tax, into sales of natural gas, oil and NGLs (effective portion) | $ | 15,940 |  |  | $ | 42,581 |  |  | $ | 28,364 |  |  | $ | 83,332 |
Interest rate derivatives designated as cash flow hedges |  |  |  |  |  |  |  |  |  |  |
Amount of loss reclassified from accumulated OCI, net of tax, into interest expense (effective portion) | $ | (36 | ) |  | $ | (36 | ) |  | $ | (72 | ) |  | $ | (72 | )
Derivatives not designated as hedging instruments |  |  |  |  |  |  |  |  |  |  |
Amount recognized in (loss) gain on derivatives not designated as hedges | $ | (234,693 | ) |  | $ | 4,259 |  |  | $ | (125,698 | ) |  | $ | 47,851 |
Schedule of impact of netting agreements and margin deposits on gross derivative assets | The table below reflects the impact of netting agreements and margin deposits on gross derivative assets and liabilities as of June 30, 2016 and December 31, 2015.
As of June 30, 2016 |  | Derivative instruments, recorded in the Condensed Consolidated Balance Sheet, gross |  | Derivative instruments subject to master netting agreements |  | Margin deposits remitted to counterparties |  | Derivative instruments, net
|  | (Thousands)
Asset derivatives: |  |  |  |  |  |  |  |  |  |  |  |
Derivative instruments, at fair value |  | $ | 136,591 |  |  | $ | (70,234 | ) |  | $ | — |  |  | $ | 66,357 |
Liability derivatives: |  |  |  |  |  |  |  |  |  |  |  |
Derivative instruments, at fair value |  | $ | 110,960 |  |  | $ | (70,234 | ) |  | $ | — |  |  | $ | 40,726 |
As of December 31, 2015 |  | Derivative instruments, recorded in the Condensed Consolidated Balance Sheet, gross |  | Derivative instruments subject to master netting agreements |  | Margin deposits remitted to counterparties |  | Derivative instruments, net
|  | (Thousands)
Asset derivatives: |  |  |  |  |  |  |  |  |  |  |  |
Derivative instruments, at fair value |  | $ | 417,397 |  |  | $ | (19,909 | ) |  | $ | — |  |  | $ | 397,488 |
Liability derivatives: |  |  |  |  |  |  |  |  |  |  |  |
Derivative instruments, at fair value |  | $ | 23,434 |  |  | $ | (19,909 | ) |  | $ | — |  |  | $ | 3,525 |
Schedule of impact of netting agreements and margin deposits on gross derivative liabilities | The table below reflects the impact of netting agreements and margin deposits on gross derivative assets and liabilities as of June 30, 2016 and December 31, 2015.
As of June 30, 2016 |  | Derivative instruments, recorded in the Condensed Consolidated Balance Sheet, gross |  | Derivative instruments subject to master netting agreements |  | Margin deposits remitted to counterparties |  | Derivative instruments, net
|  | (Thousands)
Asset derivatives: |  |  |  |  |  |  |  |  |  |  |  |
Derivative instruments, at fair value |  | $ | 136,591 |  |  | $ | (70,234 | ) |  | $ | — |  |  | $ | 66,357 |
Liability derivatives: |  |  |  |  |  |  |  |  |  |  |  |
Derivative instruments, at fair value |  | $ | 110,960 |  |  | $ | (70,234 | ) |  | $ | — |  |  | $ | 40,726 |
As of December 31, 2015 |  | Derivative instruments, recorded in the Condensed Consolidated Balance Sheet, gross |  | Derivative instruments subject to master netting agreements |  | Margin deposits remitted to counterparties |  | Derivative instruments, net
|  | (Thousands)
Asset derivatives: |  |  |  |  |  |  |  |  |  |  |  |
Derivative instruments, at fair value |  | $ | 417,397 |  |  | $ | (19,909 | ) |  | $ | — |  |  | $ | 397,488 |
Liability derivatives: |  |  |  |  |  |  |  |  |  |  |  |
Derivative instruments, at fair value |  | $ | 23,434 |  |  | $ | (19,909 | ) |  | $ | — |  |  | $ | 3,525 |

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