Derivative Financial Instruments (Details 2) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Offsetting Derivative Assets [Abstract]
Derivative liability		$ (15,239)
Total	$ 53,053
Derivative Asset (Liability) Subject to Master Netting Arrangement	(3,207)
Derivative Asset (Liability), Net	49,846
Offsetting Derivative Liabilities [Abstract]
Derivative Asset		0
Current assets
Offsetting Derivative Assets [Abstract]
Gross amounts of recognized liabilities		131,092
Gross amounts netted in the consolidated balance sheet		129,902
Derivative liability		1,190
Offsetting Derivative Liabilities [Abstract]
Gross amounts of recognized assets	53,136
Gross amounts netted in the consolidated balance sheets	(3,207)
Derivative Asset	49,929
Long-term liabilities
Offsetting Derivative Assets [Abstract]
Gross amounts of recognized liabilities	(83)
Gross amounts netted in the consolidated balance sheet	0
Derivative liability	$ (83)
Current liabilities
Offsetting Derivative Assets [Abstract]
Gross amounts of recognized liabilities		(146,331)
Gross amounts netted in the consolidated balance sheet		(129,902)
Derivative liability		$ (16,429)

Derivative Asset (Liability), Net

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Derivative Asset (Liability) Subject to Master Netting Arrangement

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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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Fair value, after the effects of master netting arrangements, of a 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. Includes assets not subject to a master netting arrangement and not elected to be offset.

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Fair value, before effects of master netting arrangements, of a 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. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement.

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Fair value of the assets less the liabilities of a derivative or group of derivatives.

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Fair value of asset associated with financial liability or 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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