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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 26,905 94,639
Derivative assets, current 12,779 71,022
Derivative assets, noncurrent 14,126 23,617
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 34,267 14,860
Derivative liabilities, noncurrent 20,564 59,787
Derivative liabilities, amount net of offset 54,831 74,647
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