Derivatives - Offsetting Assets and Liabilities (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
ASSETS
Derivative assets, gross amounts	$ 50,274	$ 130,403
Derivative assets, gross amounts offset	(23,369)	(35,764)
Derivative assets, amounts net of offset	26,905us-gaap_DerivativeAssets	94,639us-gaap_DerivativeAssets
Derivative assets, current	12,779us-gaap_DerivativeAssetsCurrent	71,022us-gaap_DerivativeAssetsCurrent
Derivative assets, noncurrent	14,126us-gaap_DerivativeAssetsNoncurrent	23,617us-gaap_DerivativeAssetsNoncurrent
Derivative assets, financial collateral	0	0
Derivative assets, net amount	26,905	94,639
LIABILITIES
Derivative liabilities, gross amounts	78,200	110,411
Derivative liabilities, gross amounts offset	(23,369)	(35,764)
Derivative liabilities, current	34,267us-gaap_DerivativeLiabilitiesCurrent	14,860us-gaap_DerivativeLiabilitiesCurrent
Derivative liabilities, noncurrent	20,564us-gaap_DerivativeLiabilitiesNoncurrent	59,787us-gaap_DerivativeLiabilitiesNoncurrent
Derivative liabilities, amount net of offset	54,831us-gaap_DerivativeLiabilities	74,647us-gaap_DerivativeLiabilities
Derivative liabilities, financial collateral	(54,831)	(74,647)
Derivative liabilities, net amount	0	0
Current assets
ASSETS
Derivative assets, gross amounts	18,368	91,346
Derivative assets, gross amounts offset	(5,589)	(20,324)
Derivative assets, financial collateral	0	0
Derivative assets, net amount	12,779	71,022
Noncurrent assets
ASSETS
Derivative assets, gross amounts	31,906	39,057
Derivative assets, gross amounts offset	(17,780)	(15,440)
Derivative assets, financial collateral	0	0
Derivative assets, net amount	14,126	23,617
Current liabilities
LIABILITIES
Derivative liabilities, gross amounts	39,856	35,184
Derivative liabilities, gross amounts offset	(5,589)	(20,324)
Derivative liabilities, financial collateral	(34,267)	(14,860)
Derivative liabilities, net amount	0	0
Noncurrent liabilities
LIABILITIES
Derivative liabilities, gross amounts	38,344	75,227
Derivative liabilities, gross amounts offset	(17,780)	(15,440)
Derivative liabilities, financial collateral	(20,564)	(59,787)
Derivative liabilities, net amount	$ 0	$ 0

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