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Financial Instruments (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2017
Dec. 31, 2016
Assets [Abstract]    
NYMEX Fixed Price Derivative contracts $ 6,777 $ 54
Liabilities [Abstract]    
NYMEX Fixed Price Derivative contracts 528 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 340  
Settlements during the period 41  
Unobservable inputs at June 30, 2017 147  
Recurring Basis [Member]    
Assets [Abstract]    
Total Assets 6,777 54
Liabilities [Abstract]    
Total Liabilities 528 9,012
Recurring Basis [Member] | Fixed Price Derivative Contracts [Member]    
Assets [Abstract]    
NYMEX Fixed Price Derivative contracts 6,630 35
Liabilities [Abstract]    
NYMEX Fixed Price Derivative contracts 528 8,759
Recurring Basis [Member] | Collars [Member]    
Assets [Abstract]    
NYMEX Fixed Price Derivative contracts 147 19
Liabilities [Abstract]    
NYMEX Fixed Price Derivative contracts 0 253
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 6,630 35
Liabilities [Abstract]    
Total Liabilities 528 8,759
Recurring Basis [Member] | Significant Other Observable Inputs (Level 2) [Member] | Fixed Price Derivative Contracts [Member]    
Assets [Abstract]    
NYMEX Fixed Price Derivative contracts 6,630 35
Liabilities [Abstract]    
NYMEX Fixed Price Derivative contracts 528 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 147 19
Liabilities [Abstract]    
Total Liabilities 0 253
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 147 19
Liabilities [Abstract]    
NYMEX Fixed Price Derivative contracts $ 0 $ 253