Derivative Instruments - Fair Value of Derivative Instruments Balance Sheet Classification (Details) - Not Designated as Hedging Instrument - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Derivative Assets
Gross Asset/Liability Amounts	$ 1,806	$ 739
Netting Adjustments	(159)	(308)
Net Recognized Fair Value Assets/Liabilities	1,647	431
Derivative Liabilities
Gross Asset/Liability Amounts	344	5,689
Netting Adjustments	(159)	(308)
Net Recognized Fair Value Assets/Liabilities	185	5,381
Current assets
Derivative Assets
Gross Asset/Liability Amounts	1,675	739
Netting Adjustments	(159)	(308)
Net Recognized Fair Value Assets/Liabilities	1,516	431
Noncurrent assets
Derivative Assets
Gross Asset/Liability Amounts	131
Netting Adjustments	0
Net Recognized Fair Value Assets/Liabilities	131
Current liabilities
Derivative Liabilities
Gross Asset/Liability Amounts	344	5,669
Netting Adjustments	(159)	(308)
Net Recognized Fair Value Assets/Liabilities	$ 185	5,361
Noncurrent Liabilities
Derivative Liabilities
Gross Asset/Liability Amounts		20
Netting Adjustments		0
Net Recognized Fair Value Assets/Liabilities		$ 20

Fair value of liability associated with financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset.

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