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Financial Instruments (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2017
Dec. 31, 2016
Assets [Abstract]    
NYMEX Fixed Price Derivative contracts $ 2,617 $ 54
Liabilities [Abstract]    
NYMEX Fixed Price Derivative contracts 3,578 9,012
Significant Unobservable Inputs (Level 3) [Member]    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]    
Unobservable inputs at January 1, 2017 (234)  
Changes in market value 189  
Settlements during the period 73  
Unobservable inputs at September 30, 2017 28  
Recurring Basis [Member]    
Assets [Abstract]    
Total Assets 2,617 54
Liabilities [Abstract]    
Total Liabilities 3,578 9,012
Recurring Basis [Member] | Fixed Price Derivative Contracts [Member]    
Assets [Abstract]    
NYMEX Fixed Price Derivative contracts 2,575 35
Liabilities [Abstract]    
NYMEX Fixed Price Derivative contracts 3,564 8,759
Recurring Basis [Member] | Collars [Member]    
Assets [Abstract]    
NYMEX Fixed Price Derivative contracts 42 19
Liabilities [Abstract]    
NYMEX Fixed Price Derivative contracts 14 253
Recurring Basis [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]    
Assets [Abstract]    
Total Assets 0 0
Liabilities [Abstract]    
Total Liabilities 0 0
Recurring Basis [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Fixed Price Derivative Contracts [Member]    
Assets [Abstract]    
NYMEX Fixed Price Derivative contracts 0 0
Liabilities [Abstract]    
NYMEX Fixed Price Derivative contracts 0 0
Recurring Basis [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Collars [Member]    
Assets [Abstract]    
NYMEX Fixed Price Derivative contracts 0 0
Liabilities [Abstract]    
NYMEX Fixed Price Derivative contracts 0 0
Recurring Basis [Member] | Significant Other Observable Inputs (Level 2) [Member]    
Assets [Abstract]    
Total Assets 2,575 35
Liabilities [Abstract]    
Total Liabilities 3,564 8,759
Recurring Basis [Member] | Significant Other Observable Inputs (Level 2) [Member] | Fixed Price Derivative Contracts [Member]    
Assets [Abstract]    
NYMEX Fixed Price Derivative contracts 2,575 35
Liabilities [Abstract]    
NYMEX Fixed Price Derivative contracts 3,564 8,759
Recurring Basis [Member] | Significant Other Observable Inputs (Level 2) [Member] | Collars [Member]    
Assets [Abstract]    
NYMEX Fixed Price Derivative contracts 0 0
Liabilities [Abstract]    
NYMEX Fixed Price Derivative contracts 0 0
Recurring Basis [Member] | Significant Unobservable Inputs (Level 3) [Member]    
Assets [Abstract]    
Total Assets 42 19
Liabilities [Abstract]    
Total Liabilities 14 253
Recurring Basis [Member] | Significant Unobservable Inputs (Level 3) [Member] | Fixed Price Derivative Contracts [Member]    
Assets [Abstract]    
NYMEX Fixed Price Derivative contracts 0 0
Liabilities [Abstract]    
NYMEX Fixed Price Derivative contracts 0 0
Recurring Basis [Member] | Significant Unobservable Inputs (Level 3) [Member] | Collars [Member]    
Assets [Abstract]    
NYMEX Fixed Price Derivative contracts 42 19
Liabilities [Abstract]    
NYMEX Fixed Price Derivative contracts $ 14 $ 253