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Derivatives - Offsetting Assets and Liabilities (Details) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Assets    
Derivative assets, gross amounts $ 62,210 $ 85,524
Derivative assets, gross amounts offset (807) (1,175)
Derivative assets, amounts net of offset 61,403 84,349
Derivative assets, financial collateral 0 0
Derivative assets, net amount 61,403 84,349
Liabilities    
Derivative liabilities, gross amounts 1,162 1,748
Derivative liabilities, gross amounts offset (807) (1,175)
Derivative liabilities, amounts net of offset 355 573
Derivative liabilities, financial collateral (355) (573)
Derivative liabilities, net amount 0 0
Current assets    
Assets    
Derivative assets, gross amounts 62,210 85,524
Derivative assets, gross amounts offset (807) (1,175)
Derivative assets, amounts net of offset 61,403 84,349
Derivative assets, financial collateral 0 0
Derivative assets, net amount 61,403 84,349
Noncurrent assets    
Assets    
Derivative assets, gross amounts 0 0
Derivative assets, gross amounts offset 0 0
Derivative assets, amounts net of offset 0 0
Derivative assets, financial collateral 0 0
Derivative assets, net amount 0 0
Current liabilities    
Liabilities    
Derivative liabilities, gross amounts 1,162 1,748
Derivative liabilities, gross amounts offset (807) (1,175)
Derivative liabilities, amounts net of offset 355 573
Derivative liabilities, financial collateral (355) (573)
Derivative liabilities, net amount 0 0
Noncurrent liabilities    
Liabilities    
Derivative liabilities, gross amounts 0 0
Derivative liabilities, gross amounts offset 0 0
Derivative liabilities, amounts net of offset 0 0
Derivative liabilities, financial collateral 0 0
Derivative liabilities, net amount $ 0 $ 0