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Derivatives - Effect of Derivative Instruments on Balance Sheet (Details) - Derivatives designated as hedging instruments: - Interest rate swaps - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Fair Value Asset (Liability)    
Total derivatives $ 587 $ (3,190)
Other long-term assets    
Fair Value Asset (Liability)    
Derivative assets 1,884 413
Accrued liabilities    
Fair Value Asset (Liability)    
Derivative liabilities (1,297) (3,226)
Other long-term liabilities    
Fair Value Asset (Liability)    
Derivative liabilities $ 0 $ (377)