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Derivative Instruments (Details) $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2017 USD ($) MMcf | Dec. 31, 2014 MMcf | Dec. 31, 2016 USD ($)
Commodity Member [Member] |  |  |
Derivative [Line Items] |  |  |
Derivative, Nonmonetary Notional Amount, Volume | MMcf | 819,100,000,000 | 744,700,000,000 |
Derivative Liability, Current | $ | $ 25,838 |  | $ 67,139
Derivative Liability, Noncurrent | $ | 122,747 |  | 209,980
Derivative Asset, Noncurrent | $ | $ 58,422 |  | $ 29,596
Basis Member [Member] |  |  |
Derivative [Line Items] |  |  |
Derivative, Nonmonetary Notional Amount, Volume | MMcf | 476,800,000,000 | 482,000,000,000 |
Propane [Member] |  |  |
Derivative [Line Items] |  |  |
Derivative, Nonmonetary Notional Amount, Volume | MMcf | 0 | 126,000 |

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