Other Current Assets Components of Other Current Assets (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Value added tax receivables	$ 15,568	$ 21,273
Recoverable income taxes	46	261
Derivatives (foreign currency forward contracts)	2,204	520
Prepaid insurance	368	2,713
Prepaid and other current assets	12,942	12,031
Other current assets	$ 31,128	$ 36,798