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Derivatives - Offsetting Assets and Liabilities (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Assets    
Derivative assets, gross amounts $ 6,490 $ 50,274
Derivative assets, gross amounts offset (3,549) (23,369)
Derivative assets, current 115 12,779
Derivative assets, noncurrent 2,826 14,126
Derivative assets, amounts net of offset 2,941 26,905
Derivative assets, financial collateral 0 0
Derivative assets, net amount 2,941 26,905
Liabilities    
Derivative liabilities, gross amounts 65,810 78,200
Derivative liabilities, gross amounts offset (3,549) (23,369)
Derivative contracts 56,728 34,267
Derivative liabilities, noncurrent 5,533 20,564
Derivative liabilities, amounts net of offset 62,261 54,831
Derivative liabilities, financial collateral (62,261) (54,831)
Derivative liabilities, net amount 0 0
Current assets
    
Assets    
Derivative assets, gross amounts 3,471 18,368
Derivative assets, gross amounts offset (3,356) (5,589)
Derivative assets, financial collateral 0 0
Derivative assets, net amount 115 12,779
Noncurrent assets
    
Assets    
Derivative assets, gross amounts 3,019 31,906
Derivative assets, gross amounts offset (193) (17,780)
Derivative assets, financial collateral 0 0
Derivative assets, net amount 2,826 14,126
Current liabilities
    
Liabilities    
Derivative liabilities, gross amounts 60,084 39,856
Derivative liabilities, gross amounts offset (3,356) (5,589)
Derivative liabilities, financial collateral (56,728) (34,267)
Derivative liabilities, net amount 0 0
Noncurrent liabilities
    
Liabilities    
Derivative liabilities, gross amounts 5,726 38,344
Derivative liabilities, gross amounts offset (193) (17,780)
Derivative liabilities, financial collateral (5,533) (20,564)
Derivative liabilities, net amount $ 0 $ 0