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Income Taxes - Activity related to the Company's Valuation Allowance (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Movement in Valuation Allowances [Roll Forward]      
Balance at January 1 $ (4,326) $ (4,264) $ (5,128)
(Charged) Credited to Expense (763) 414 25
Net write-offs 0 0 0
Foreign currency translation adjustment 1,425 (476) 839
Balance at December 31 $ (3,664) $ (4,326) $ (4,264)