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Derivatives - Offsetting Assets and Liabilities (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Assets    
Derivative assets, gross amounts $ 30,803 $ 50,274
Derivative assets, gross amounts offset (3,753) (23,369)
Derivative assets, current 9,002 12,779
Derivative assets, noncurrent 18,048 14,126
Derivative assets, amounts net of offset 27,050 26,905
Derivative assets, financial collateral 0 0
Derivative assets, net amount 27,050 26,905
Liabilities    
Derivative liabilities, gross amounts 17,928 78,200
Derivative liabilities, gross amounts offset (3,753) (23,369)
Derivative liabilities, current 14,175 34,267
Derivative liabilities, noncurrent 0 20,564
Derivative liabilities, amounts net of offset 14,175 54,831
Derivative liabilities, financial collateral (14,175) (54,831)
Derivative liabilities, net amount 0 0
Current assets
    
Assets    
Derivative assets, gross amounts 12,755 18,368
Derivative assets, gross amounts offset (3,753) (5,589)
Derivative assets, financial collateral 0 0
Derivative assets, net amount 9,002 12,779
Noncurrent assets
    
Assets    
Derivative assets, gross amounts 18,048 31,906
Derivative assets, gross amounts offset 0 (17,780)
Derivative assets, financial collateral 0 0
Derivative assets, net amount 18,048 14,126
Current liabilities
    
Liabilities    
Derivative liabilities, gross amounts 17,928 39,856
Derivative liabilities, gross amounts offset (3,753) (5,589)
Derivative liabilities, financial collateral (14,175) (34,267)
Derivative liabilities, net amount 0 0
Noncurrent liabilities
    
Liabilities    
Derivative liabilities, gross amounts   38,344
Derivative liabilities, gross amounts offset   (17,780)
Derivative liabilities, financial collateral   (20,564)
Derivative liabilities, net amount   $ 0