Other Current Assets - Components of Other Current Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Value added tax receivables	$ 18,031	$ 21,273
Recoverable income taxes	367	261
Derivatives (foreign currency forward contracts)	4,143	520
Prepaid insurance	2,538	2,713
Prepaid and other current assets	9,380	12,031
Other current assets	$ 34,459	$ 36,798