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Derivative Instruments (Tables) | 9 Months Ended
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Sep. 30, 2018
Derivative Instruments and Hedging Activities Disclosure [Abstract] |
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 September 30, 2018 and December 31, 2017. The margin deposit within the table as of September 30, 2018 represents funds remitted to a broker for exchange traded derivative commodity instruments.
As of September 30, 2018 |  | 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 |  | $ | 315,564 |  |  | $ | (104,559 | ) |  | $ | — |  |  | $ | 211,005 |
Liability derivatives: |  |  |  |  |  |  |  |  |  |
Derivative instruments, at fair value |  | $ | 183,677 |  |  | $ | (104,559 | ) |  | $ | (11,110 | ) |  | $ | 68,008 |
As of December 31, 2017 |  | 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 |  | $ | 241,952 |  |  | $ | (86,856 | ) |  | $ | — |  |  | $ | 155,096 |
Liability derivatives: |  |  |  |  |  |  |  |  |  |  |  |
Derivative instruments, at fair value |  | $ | 139,089 |  |  | $ | (86,856 | ) |  | $ | — |  |  | $ | 52,233 |
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 September 30, 2018 and December 31, 2017. The margin deposit within the table as of September 30, 2018 represents funds remitted to a broker for exchange traded derivative commodity instruments.
As of September 30, 2018 |  | 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 |  | $ | 315,564 |  |  | $ | (104,559 | ) |  | $ | — |  |  | $ | 211,005 |
Liability derivatives: |  |  |  |  |  |  |  |  |  |
Derivative instruments, at fair value |  | $ | 183,677 |  |  | $ | (104,559 | ) |  | $ | (11,110 | ) |  | $ | 68,008 |
As of December 31, 2017 |  | 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 |  | $ | 241,952 |  |  | $ | (86,856 | ) |  | $ | — |  |  | $ | 155,096 |
Liability derivatives: |  |  |  |  |  |  |  |  |  |  |  |
Derivative instruments, at fair value |  | $ | 139,089 |  |  | $ | (86,856 | ) |  | $ | — |  |  | $ | 52,233 |

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