Other Current Assets Components of Other Current Assets (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Value added tax receivables	$ 18,438	$ 20,445
Recoverable income taxes	2,359	2,465
Derivatives (foreign currency forward contracts)	1,140	789
Prepaid insurance	214	4,556
Prepaid and other current assets	15,110	12,917
Other current assets	$ 37,261	$ 41,172