Other Current Assets - Components of Other Current Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Value added tax receivables	$ 14,336	$ 18,031
Service contracts	2,902	2,013
Prepaid insurance	2,761	2,538
Derivatives (foreign currency forward contracts)	2,754	4,143
Prepaid inventory	790	158
Recoverable income taxes	503	367
Prepaid debt fees	489	869
Prepaid and other current assets	6,984	6,313
Other current assets	$ 31,519	$ 34,432