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 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Derivatives Designated as Hedging Instruments | Interest rate swap instruments        
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of Gain Recognized in Net Income (Loss) $ (31) $ (55) $ (133) $ (178)
Not Designated as Hedging Instrument | Interest rate swap instruments        
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of Gain Recognized in Net Income (Loss) (61) 0 73 0
Not Designated as Hedging Instrument | Commodity swap contracts        
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of Gain Recognized in Net Income (Loss) $ 45 $ 0 $ (45) $ 0