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Derivatives - Offsetting Assets and Liabilities (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Assets    
Derivative assets, gross amounts $ 90,707 $ 130,403
Derivative assets, amounts offset (39,795) (35,764)
Derivative assets, net amounts 50,912 94,639
Derivative assets, financial collateral 0 0
Derivative assets, net amount 50,912 94,639
Liabilities    
Derivative liabilities, gross amounts 93,149 110,411
Derivative liabilities, amounts offset (39,795) (35,764)
Derivative liabilities, net amounts 53,354 74,647
Derivative liabilities, financial collateral (53,354) (74,647)
Derivative liabilities, net amount 0 0
Current assets
    
Assets    
Derivative assets, gross amounts 45,339 91,346
Derivative assets, amounts offset (19,646) (20,324)
Derivative assets, net amounts 25,693 71,022
Derivative assets, financial collateral 0 0
Derivative assets, net amount 25,693 71,022
Noncurrent assets
    
Assets    
Derivative assets, gross amounts 45,368 39,057
Derivative assets, amounts offset (20,149) (15,440)
Derivative assets, net amounts 25,219 23,617
Derivative assets, financial collateral 0 0
Derivative assets, net amount 25,219 23,617
Current liabilities
    
Liabilities    
Derivative liabilities, gross amounts 32,616 35,184
Derivative liabilities, amounts offset (19,646) (20,324)
Derivative liabilities, net amounts 12,970 14,860
Derivative liabilities, financial collateral (12,970) (14,860)
Derivative liabilities, net amount 0 0
Noncurrent liabilities
    
Liabilities    
Derivative liabilities, gross amounts 60,533 75,227
Derivative liabilities, amounts offset (20,149) (15,440)
Derivative liabilities, net amounts 40,384 59,787
Derivative liabilities, financial collateral (40,384) (59,787)
Derivative liabilities, net amount $ 0 $ 0