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Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Beginning Balance $ (39,548) $ (24,406)
Other comprehensive income (loss) (13,677) (15,142)
Ending Balance (53,225) (39,548)
Foreign Currency Translation Adjustment [Member]    
Beginning Balance (37,675) (22,195)
Other comprehensive income (loss) (13,063) (15,480)
Ending Balance (50,738) (37,675)
Liquidation Of Non-US Entity [Member]    
Beginning Balance
Other comprehensive income (loss) 288
Ending Balance 288
Defined Benefit Pension Plan [Member]    
Beginning Balance (1,873) (2,211)
Other comprehensive income (loss) (902) 338
Ending Balance $ (2,775) $ (1,873)