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Fair Value Measurements (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash collateral $ 800 $ 0
Fair Value, Measurements, Recurring [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets, Fair Value Disclosure, Recurring 171 480
Net assets 126 419
Fair Value, Measurements, Recurring [Member] | Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets, Fair Value Disclosure, Recurring 0 0
Net assets 0 0
Fair Value, Measurements, Recurring [Member] | Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets, Fair Value Disclosure, Recurring 171 480
Net assets 126 419
Fair Value, Measurements, Recurring [Member] | Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets, Fair Value Disclosure, Recurring 0 0
Net assets 0 0
Fair Value, Measurements, Recurring [Member] | Interest rate derivatives    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Asset 0 24
Fair Value, Measurements, Recurring [Member] | Interest rate derivatives | Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Asset 0 0
Fair Value, Measurements, Recurring [Member] | Interest rate derivatives | Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Asset 0  
Fair Value, Measurements, Recurring [Member] | Interest rate derivatives | Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Asset 0 0
Fair Value, Measurements, Recurring [Member] | OTC commodity swaps    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Asset 171 456
Derivative Liability (45) (61)
Fair Value, Measurements, Recurring [Member] | OTC commodity swaps | Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Asset 0 0
Derivative Liability 0 0
Fair Value, Measurements, Recurring [Member] | OTC commodity swaps | Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Asset 171  
Derivative Liability (45)  
Fair Value, Measurements, Recurring [Member] | OTC commodity swaps | Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Asset 0 0
Derivative Liability 0 $ 0
Other Noncurrent Assets [Member] | Derivatives not designated as hedging instrument [Member] | Fair Value, Measurements, Recurring [Member] | Interest rate derivatives | Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Asset 24  
Other Current Assets [Member] | Derivatives not designated as hedging instrument [Member] | Fair Value, Measurements, Recurring [Member] | OTC commodity swaps | Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Asset 456  
Derivative Liability $ (61)