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) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Other expenses, net | Derivatives Designated as Hedging Instruments | Interest rate swap instruments        
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of Gain Recognized in Net Income $ (55) $ (83) $ (178) $ (153)