Other Expense/(Income), net (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Other Income and Expenses [Abstract]
Currency transactions	$ 4,634	$ (3,532)	$ 1,496
Bank fees and amortization of debt issuance costs	487	759	916
Gain on insurance recovery	(2,000)
Loss due to theft		2,506
Gain on sale of investment			(872)
Other	1,231	313	893
Total	$ 4,352	$ 46	$ 2,433