Derivatives - Offsetting Assets and Liabilities (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Assets
Derivative assets, gross amounts	$ 251,690	$ 338,417
Derivative assets, gross amounts offset	(284)	0
Derivative assets, current	209,059us-gaap_DerivativeAssetsCurrent	291,414us-gaap_DerivativeAssetsCurrent
Derivative assets, noncurrent	42,347us-gaap_DerivativeAssetsNoncurrent	47,003us-gaap_DerivativeAssetsNoncurrent
Derivative assets, amounts net of offset	251,406us-gaap_DerivativeAssets	338,417us-gaap_DerivativeAssets
Derivative assets, financial collateral	0	0
Derivative assets, net amount	251,406	338,417
Liabilities
Derivative liabilities, gross amounts	403	0
Derivative liabilities, gross amounts offset	(284)	0
Derivative contracts	119us-gaap_DerivativeLiabilitiesCurrent	0us-gaap_DerivativeLiabilitiesCurrent
Derivative liabilities, noncurrent	0us-gaap_DerivativeLiabilitiesNoncurrent	0us-gaap_DerivativeLiabilitiesNoncurrent
Derivative liabilities, amounts net of offset	119us-gaap_DerivativeLiabilities	0us-gaap_DerivativeLiabilities
Derivative liabilities, financial collateral	(119)	0
Derivative liabilities, net amount	0	0
Current assets
Assets
Derivative assets, gross amounts	209,343	291,414
Derivative assets, gross amounts offset	(284)	0
Derivative assets, financial collateral	0	0
Derivative assets, net amount	209,059	291,414
Noncurrent assets
Assets
Derivative assets, gross amounts	42,347	47,003
Derivative assets, gross amounts offset	0	0
Derivative assets, financial collateral	0	0
Derivative assets, net amount	42,347	47,003
Current liabilities
Liabilities
Derivative liabilities, gross amounts	403	0
Derivative liabilities, gross amounts offset	(284)	0
Derivative liabilities, financial collateral	(119)	0
Derivative liabilities, net amount	0	0
Noncurrent liabilities
Liabilities
Derivative liabilities, gross amounts	0	0
Derivative liabilities, gross amounts offset	0	0
Derivative liabilities, financial collateral	0	0
Derivative liabilities, net amount	$ 0	$ 0

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