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Derivative Instruments - Fair Value of Derivative Instruments Balance Sheet Classification (Details) - Not Designated as Hedging Instrument - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Derivative Assets    
Gross Asset/Liability Amounts $ 808 $ 739
Netting Adjustments (183) (308)
Net Recognized Fair Value Assets/Liabilities 625 431
Derivative Liabilities    
Gross Asset/Liability Amounts 633 5,689
Netting Adjustments (183) (308)
Net Recognized Fair Value Assets/Liabilities 450 5,381
Current assets    
Derivative Assets    
Gross Asset/Liability Amounts 562 739
Netting Adjustments (179) (308)
Net Recognized Fair Value Assets/Liabilities 383 431
Noncurrent assets    
Derivative Assets    
Gross Asset/Liability Amounts 246  
Netting Adjustments (4)  
Net Recognized Fair Value Assets/Liabilities 242  
Current liabilities    
Derivative Liabilities    
Gross Asset/Liability Amounts 629 5,669
Netting Adjustments (179) (308)
Net Recognized Fair Value Assets/Liabilities 450 5,361
Noncurrent Liabilities    
Derivative Liabilities    
Gross Asset/Liability Amounts 4 20
Netting Adjustments (4) 0
Net Recognized Fair Value Assets/Liabilities $ 0 $ 20