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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

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