Annual report pursuant to Section 13 and 15(d)

Other Expenses, Net (Details)

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Other Expenses, Net (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Other Income and Expenses [Abstract]      
Unrealized gain on interest rate swaps $ (271) $ (279) $ (368)
Interest expense, net of interest income 8,086 6,510 3,734
Amortization of deferred financing fees, net 1,350 1,173 1,030
Foreign currency transaction (gain) loss (1,294) 5 2,369
Other expenses, net $ 7,871 $ 7,409 $ 6,765