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Schedule of Fair Values (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Assets, Fair Value Disclosure $ 1,519 $ 304
Derivative, Liabilities, Fair Value Disclosure 1,007 2,259
Fair Value, Measurements, Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Asset, Fair Value, Gross Liability and Obligation to Return Cash, Offset (1,408) (1,282)
Derivative Liability, Fair Value, Gross Asset and Right to Reclaim Cash, Offset (5,794) (11,497)
Fair Value, Measurements, Recurring | Fair Value    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Assets, Total 1,519 304
Derivative Liabilities, Total 1,007 2,259
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Assets, Total 0 0
Derivative Liabilities, Total 0 0
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Assets, Total 2,927 1,586
Derivative Liabilities, Total 6,801 13,756
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Assets, Total 0 0
Derivative Liabilities, Total 0 0
Fair Value, Measurements, Recurring | Commodity Contract    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Asset, Fair Value, Gross Liability and Obligation to Return Cash, Offset (1,408) (1,282)
Derivative Liability, Fair Value, Gross Asset and Right to Reclaim Cash, Offset (5,794) (11,497)
Fair Value, Measurements, Recurring | Commodity Contract | Fair Value    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Assets, Fair Value Disclosure 1,519 304
Derivative, Liabilities, Fair Value Disclosure 1,007 2,259
Fair Value, Measurements, Recurring | Commodity Contract | Fair Value, Inputs, Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Assets, Fair Value Disclosure 0 0
Derivative, Liabilities, Fair Value Disclosure 0 0
Fair Value, Measurements, Recurring | Commodity Contract | Fair Value, Inputs, Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Assets, Fair Value Disclosure 2,927 1,586
Derivative, Liabilities, Fair Value Disclosure 6,801 13,756
Fair Value, Measurements, Recurring | Commodity Contract | Fair Value, Inputs, Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Assets, Fair Value Disclosure 0 0
Derivative, Liabilities, Fair Value Disclosure $ 0 $ 0