Other Current Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
VAT receivable	$ 9,306	$ 4,463
Other	4,741	7,834
Total other current assets	$ 14,047	$ 12,297