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Derivatives - Offsetting Assets and Liabilities (Details) - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Assets    
Derivative assets, gross amounts $ 11,429 $ 85,524
Derivative assets, gross amounts offset (1,167) (1,175)
Derivative assets, amounts net of offset 10,262 84,349
Derivative assets, financial collateral 0 0
Derivative assets, net amount 10,262 84,349
Liabilities    
Derivative liabilities, gross amounts 5,084 1,748
Derivative liabilities, gross amounts offset (1,167) (1,175)
Derivative liabilities, amounts net of offset 3,917 573
Derivative liabilities, financial collateral (3,917) (573)
Derivative liabilities, net amount 0 0
Current assets    
Assets    
Derivative assets, gross amounts 11,319 85,524
Derivative assets, gross amounts offset (1,127) (1,175)
Derivative assets, amounts net of offset 10,192 84,349
Derivative assets, financial collateral 0 0
Derivative assets, net amount 10,192 84,349
Noncurrent assets    
Assets    
Derivative assets, gross amounts 110 0
Derivative assets, gross amounts offset (40) 0
Derivative assets, amounts net of offset 70 0
Derivative assets, financial collateral 0 0
Derivative assets, net amount 70 0
Current liabilities    
Liabilities    
Derivative liabilities, gross amounts 4,109 1,748
Derivative liabilities, gross amounts offset (1,127) (1,175)
Derivative liabilities, amounts net of offset 2,982 573
Derivative liabilities, financial collateral (2,982) (573)
Derivative liabilities, net amount 0 0
Noncurrent liabilities    
Liabilities    
Derivative liabilities, gross amounts 975 0
Derivative liabilities, gross amounts offset (40) 0
Derivative liabilities, amounts net of offset 935 0
Derivative liabilities, financial collateral (935) 0
Derivative liabilities, net amount $ 0 $ 0