Derivatives - Offsetting Assets and Liabilities (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
ASSETS
Derivative assets, gross amounts	$ 338,417	$ 50,274
Derivative assets, gross amounts offset	0	(23,369)
Derivative assets, current	291,414us-gaap_DerivativeAssetsCurrent	12,779us-gaap_DerivativeAssetsCurrent
Derivative assets, noncurrent	47,003us-gaap_DerivativeAssetsNoncurrent	14,126us-gaap_DerivativeAssetsNoncurrent
Derivative assets, amounts net of offset	338,417us-gaap_DerivativeAssets	26,905us-gaap_DerivativeAssets
Derivative assets, financial collateral	0	0
Derivative assets, net amount	338,417	26,905
LIABILITIES
Derivative liabilities, gross amounts	0	78,200
Derivative liabilities, gross amounts offset	0	(23,369)
Derivative liabilities, current	0us-gaap_DerivativeLiabilitiesCurrent	34,267us-gaap_DerivativeLiabilitiesCurrent
Derivative liabilities, noncurrent	0us-gaap_DerivativeLiabilitiesNoncurrent	20,564us-gaap_DerivativeLiabilitiesNoncurrent
Derivative liabilities, amount net of offset	0us-gaap_DerivativeLiabilities	54,831us-gaap_DerivativeLiabilities
Derivative liabilities, financial collateral	0	(54,831)
Derivative liabilities, net amount	0	0
Current assets
ASSETS
Derivative assets, gross amounts	291,414	18,368
Derivative assets, gross amounts offset	0	(5,589)
Derivative assets, financial collateral	0	0
Derivative assets, net amount	291,414	12,779
Noncurrent assets
ASSETS
Derivative assets, gross amounts	47,003	31,906
Derivative assets, gross amounts offset	0	(17,780)
Derivative assets, financial collateral	0	0
Derivative assets, net amount	47,003	14,126
Current liabilities
LIABILITIES
Derivative liabilities, gross amounts	0	39,856
Derivative liabilities, gross amounts offset	0	(5,589)
Derivative liabilities, financial collateral	0	(34,267)
Derivative liabilities, net amount	0	0
Noncurrent liabilities
LIABILITIES
Derivative liabilities, gross amounts	0	38,344
Derivative liabilities, gross amounts offset	0	(17,780)
Derivative liabilities, financial collateral	0	(20,564)
Derivative liabilities, net amount	$ 0	$ 0

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