Derivative Financial Instruments (Details 2) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Offsetting Derivative Assets [Abstract]
Gross amounts of recognized assets	$ 56,255	$ 7,896
Gross amounts netted in the consolidated balance sheet	(706)	(7,704)
Net amounts of assets presented in the consolidated balance sheet	55,549	192
Amounts subject to master netting arrangements presented on a gross basis	0	0
Offsetting Derivative Liabilities [Abstract]
Gross amounts of recognized liabilities	706	10,649
Gross amounts netted in the consolidated balance sheet	(706)	(7,704)
Net amounts of liabilities presented in the consolidated balance sheet	0	2,945
Amounts subject to master netting arrangements presented on a gross basis	0	0
Counterparty A [Member] \| Current Assets [Member]
Offsetting Derivative Assets [Abstract]
Gross amounts of recognized assets	13,437	1,746
Gross amounts netted in the consolidated balance sheet	(157)	(1,746)
Net amounts of assets presented in the consolidated balance sheet	13,280	0
Amounts subject to master netting arrangements presented on a gross basis	0	0
Offsetting Derivative Liabilities [Abstract]
Gross amounts of recognized liabilities		2,550
Gross amounts netted in the consolidated balance sheet		(1,746)
Net amounts of liabilities presented in the consolidated balance sheet		804
Amounts subject to master netting arrangements presented on a gross basis		0
Counterparty A [Member] \| Other assets [Member]
Offsetting Derivative Assets [Abstract]
Gross amounts of recognized assets	0	0
Gross amounts netted in the consolidated balance sheet	0	0
Net amounts of assets presented in the consolidated balance sheet	0	0
Amounts subject to master netting arrangements presented on a gross basis	0	0
Offsetting Derivative Liabilities [Abstract]
Gross amounts of recognized liabilities		0
Gross amounts netted in the consolidated balance sheet		0
Net amounts of liabilities presented in the consolidated balance sheet		0
Amounts subject to master netting arrangements presented on a gross basis		0
Counterparty A [Member] \| Current liabilities [Member]
Offsetting Derivative Liabilities [Abstract]
Gross amounts of recognized liabilities	157
Gross amounts netted in the consolidated balance sheet	(157)
Net amounts of liabilities presented in the consolidated balance sheet	0
Amounts subject to master netting arrangements presented on a gross basis	0
Counterparty A [Member] \| Long-term liabilities [Member]
Offsetting Derivative Liabilities [Abstract]
Gross amounts of recognized liabilities	0
Gross amounts netted in the consolidated balance sheet	0
Net amounts of liabilities presented in the consolidated balance sheet	0
Amounts subject to master netting arrangements presented on a gross basis	0
Counterparty B [Member] \| Current Assets [Member]
Offsetting Derivative Assets [Abstract]
Gross amounts of recognized assets	8,759	1,371
Gross amounts netted in the consolidated balance sheet	(116)	(1,371)
Net amounts of assets presented in the consolidated balance sheet	8,643	0
Amounts subject to master netting arrangements presented on a gross basis	0	0
Offsetting Derivative Liabilities [Abstract]
Gross amounts of recognized liabilities		2,136
Gross amounts netted in the consolidated balance sheet		(1,371)
Net amounts of liabilities presented in the consolidated balance sheet		765
Amounts subject to master netting arrangements presented on a gross basis		0
Counterparty B [Member] \| Other assets [Member]
Offsetting Derivative Assets [Abstract]
Gross amounts of recognized assets	0	841
Gross amounts netted in the consolidated balance sheet	0	(668)
Net amounts of assets presented in the consolidated balance sheet	0	173
Amounts subject to master netting arrangements presented on a gross basis	0	0
Offsetting Derivative Liabilities [Abstract]
Gross amounts of recognized liabilities		668
Gross amounts netted in the consolidated balance sheet		(668)
Net amounts of liabilities presented in the consolidated balance sheet		0
Amounts subject to master netting arrangements presented on a gross basis		0
Counterparty B [Member] \| Current liabilities [Member]
Offsetting Derivative Liabilities [Abstract]
Gross amounts of recognized liabilities	116
Gross amounts netted in the consolidated balance sheet	(116)
Net amounts of liabilities presented in the consolidated balance sheet	0
Amounts subject to master netting arrangements presented on a gross basis	0
Counterparty B [Member] \| Long-term liabilities [Member]
Offsetting Derivative Liabilities [Abstract]
Gross amounts of recognized liabilities	0
Gross amounts netted in the consolidated balance sheet	0
Net amounts of liabilities presented in the consolidated balance sheet	0
Amounts subject to master netting arrangements presented on a gross basis	0
Counterparty C [Member] \| Current Assets [Member]
Offsetting Derivative Assets [Abstract]
Gross amounts of recognized assets	25,685	2,886
Gross amounts netted in the consolidated balance sheet	(368)	(2,873)
Net amounts of assets presented in the consolidated balance sheet	25,317	13
Amounts subject to master netting arrangements presented on a gross basis	0	0
Offsetting Derivative Liabilities [Abstract]
Gross amounts of recognized liabilities		3,996
Gross amounts netted in the consolidated balance sheet		(2,873)
Net amounts of liabilities presented in the consolidated balance sheet		1,123
Amounts subject to master netting arrangements presented on a gross basis		0
Counterparty C [Member] \| Other assets [Member]
Offsetting Derivative Assets [Abstract]
Gross amounts of recognized assets	0	1,046
Gross amounts netted in the consolidated balance sheet	0	(1,046)
Net amounts of assets presented in the consolidated balance sheet	0	0
Amounts subject to master netting arrangements presented on a gross basis	0	0
Offsetting Derivative Liabilities [Abstract]
Gross amounts of recognized liabilities		1,299
Gross amounts netted in the consolidated balance sheet		(1,046)
Net amounts of liabilities presented in the consolidated balance sheet		253
Amounts subject to master netting arrangements presented on a gross basis		0
Counterparty C [Member] \| Current liabilities [Member]
Offsetting Derivative Liabilities [Abstract]
Gross amounts of recognized liabilities	368
Gross amounts netted in the consolidated balance sheet	(368)
Net amounts of liabilities presented in the consolidated balance sheet	0
Amounts subject to master netting arrangements presented on a gross basis	0
Counterparty C [Member] \| Long-term liabilities [Member]
Offsetting Derivative Liabilities [Abstract]
Gross amounts of recognized liabilities	0
Gross amounts netted in the consolidated balance sheet	0
Net amounts of liabilities presented in the consolidated balance sheet	0
Amounts subject to master netting arrangements presented on a gross basis	0
Counterparty D [Member] \| Current Assets [Member]
Offsetting Derivative Assets [Abstract]
Gross amounts of recognized assets	8,374	6
Gross amounts netted in the consolidated balance sheet	(65)	0
Net amounts of assets presented in the consolidated balance sheet	8,309	6
Amounts subject to master netting arrangements presented on a gross basis	0	0
Offsetting Derivative Liabilities [Abstract]
Gross amounts of recognized liabilities		0
Gross amounts netted in the consolidated balance sheet		0
Net amounts of liabilities presented in the consolidated balance sheet		0
Amounts subject to master netting arrangements presented on a gross basis		0
Counterparty D [Member] \| Other assets [Member]
Offsetting Derivative Assets [Abstract]
Gross amounts of recognized assets	0	0
Gross amounts netted in the consolidated balance sheet	0	0
Net amounts of assets presented in the consolidated balance sheet	0	0
Amounts subject to master netting arrangements presented on a gross basis	0	0
Offsetting Derivative Liabilities [Abstract]
Gross amounts of recognized liabilities		0
Gross amounts netted in the consolidated balance sheet		0
Net amounts of liabilities presented in the consolidated balance sheet		0
Amounts subject to master netting arrangements presented on a gross basis		0
Counterparty D [Member] \| Current liabilities [Member]
Offsetting Derivative Liabilities [Abstract]
Gross amounts of recognized liabilities	65
Gross amounts netted in the consolidated balance sheet	(65)
Net amounts of liabilities presented in the consolidated balance sheet	0
Amounts subject to master netting arrangements presented on a gross basis	0
Counterparty D [Member] \| Long-term liabilities [Member]
Offsetting Derivative Liabilities [Abstract]
Gross amounts of recognized liabilities	0
Gross amounts netted in the consolidated balance sheet	0
Net amounts of liabilities presented in the consolidated balance sheet	0
Amounts subject to master netting arrangements presented on a gross basis	$ 0

Derivative Asset, Fair Value, Subject to Master Netting, Gross Asset Basis

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Derivative Liability, Fair Value, Subject to Master Netting, Gross Liability Basis

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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 effects of master netting arrangements, of 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 offset against an obligation to return collateral. Includes assets not subject to a master netting arrangement and not elected to be offset.

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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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