Derivative Instruments - Narrative (Details)  | 
12 Months Ended | ||
|---|---|---|---|
| 
 Dec. 31, 2015  
USD ($) 
 | 
 Dec. 31, 2016  
USD ($)  
MMBTU / d  
$ / MMBTU 
 | 
 Dec. 31, 2014  
USD ($) 
 | 
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| Derivative [Line Items] | |||
| Production delivered under fixed price swaps, percentage | 77.00% | ||
| January 2017 - December 2017 | |||
| Derivative [Line Items] | |||
| Notional quantity (MMBtu/day) | MMBTU / d | 30,000 | ||
| Weighted average price of derivative swap (usd per share) | $ / MMBTU | 3.36 | ||
| January 2017 - December 2017 | Short | |||
| Derivative [Line Items] | |||
| Notional quantity (MMBtu/day) | MMBTU / d | 30,000 | ||
| Weighted average price of derivative swap (usd per share) | $ / MMBTU | 3.36 | ||
| Swap | |||
| Derivative [Line Items] | |||
| Cash flow hedges | $ 0 | $ 0 | $ 0 | 
| Swaption | |||
| Derivative [Line Items] | |||
| Cash flow hedges | 0 | 0 | 0 | 
| Basis swap | |||
| Derivative [Line Items] | |||
| Cash flow hedges | $ 0 | $ 0 | $ 0 | 
| X | ||||||||||
- Definition Production Delivered Under Fixed Price Swaps, Percentage No definition available. 
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- Definition Aggregate notional amount of derivative expressed in nonmonetary units. For example, the number of barrels specified in a fuel oil forward purchase contract. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
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- Definition Amount before tax of increase (decrease) in accumulated equity from transactions and other events and circumstances from non-owner sources, attributable to parent. Excludes net income (loss), and accumulated changes in equity from transactions resulting from investments by owners (distributions to owners). No definition available. 
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available. 
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- Definition Average fixed price related to the group of price risk swap derivatives. No definition available. 
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