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Derivatives - Offsetting Assets and Liabilities (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Assets    
Derivative assets, gross amounts $ 137,484 $ 130,403
Derivative assets, gross amounts offset (40,887) (35,764)
Derivative assets, current 53,424 71,022
Derivative assets, noncurrent 43,173 23,617
Derivative assets, net amounts 96,597 94,639
Derivative assets, financial collateral 0 0
Derivative assets, net amount 96,597 94,639
Liabilities    
Derivative liabilities, gross amounts 54,402 110,411
Derivative liabilities, gross amounts offset (40,887) (35,764)
Derivative liabilities, current 1,798 14,860
Derivative liabilities, noncurrent 11,717 59,787
Derivative liabilities, net amounts 13,515 74,647
Derivative liabilities, financial collateral (13,515) (74,647)
Derivative liabilities, net amount 0 0
Current assets
    
Assets    
Derivative assets, gross amounts 69,247 91,346
Derivative assets, gross amounts offset (15,823) (20,324)
Derivative assets, financial collateral 0 0
Derivative assets, net amount 53,424 71,022
Noncurrent assets
    
Assets    
Derivative assets, gross amounts 68,237 39,057
Derivative assets, gross amounts offset (25,064) (15,440)
Derivative assets, financial collateral 0 0
Derivative assets, net amount 43,173 23,617
Current liabilities
    
Liabilities    
Derivative liabilities, gross amounts 17,621 35,184
Derivative liabilities, gross amounts offset (15,823) (20,324)
Derivative liabilities, financial collateral (1,798) (14,860)
Derivative liabilities, net amount 0 0
Noncurrent liabilities
    
Liabilities    
Derivative liabilities, gross amounts 36,781 75,227
Derivative liabilities, gross amounts offset (25,064) (15,440)
Derivative liabilities, financial collateral (11,717) (59,787)
Derivative liabilities, net amount $ 0 $ 0