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Investments (Schedule of Noncontrolling Interest) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Noncontrolling interest at beginning of period   $ 13,762  
Net loss attributable to noncontrolling interest $ (303) (130) $ (2,009)
PST Eletronicaltda [Member]      
Noncontrolling interest at beginning of period 14,171 13,762 13,310
Net loss attributable to noncontrolling interest (303) (130) (2,009)
Foreign currency translation (164) 826 2,403
Comprehensive income (loss) related to noncontrolling interest (467) 696 394
Acquisition of noncontrolling interest   $ (14,458)  
Noncontrolling interest at end of period $ 13,704   $ 13,704