Quarterly report pursuant to Section 13 or 15(d)

Derivative Instruments and Hedging Activities - Effects on Statements of Income (Loss) and Consolidated Statements of Comprehensive Loss (Details)

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Derivative Instruments and Hedging Activities - Effects on Statements of Income (Loss) and Consolidated Statements of Comprehensive Loss (Details) - Other expenses, net - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Designated | Interest rate swap instruments        
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of (Gain) Loss Recognized in Net Income (Loss) $ (41) $ (28) $ (166) $ (206)
Not Designated | Interest rate swap instruments        
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of (Gain) Loss Recognized in Net Income (Loss) (271) 0 (344) 0
Not Designated | Commodity swap contracts        
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of (Gain) Loss Recognized in Net Income (Loss) (33) 0 12 0
Not Designated | Interest make-whole provisions        
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of (Gain) Loss Recognized in Net Income (Loss) $ 16 $ 0 $ 16 $ 0