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Reserve for Severance Activity in reserve (Details) - Employee Severance [Member] - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Reserve for severance and related payments      
Balance at beginning of period $ 311 $ 1,769 $ 4,417
Charged to earnings current year 1,273 631 837
Cash paid and exchange rate variance (887) (2,089) (3,485)
Balance at end of the period $ 697 $ 311 $ 1,769