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Investments (Schedule of Noncontrolling Interest) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Noncontrolling interest at beginning of period     $ 13,762  
Net loss attributable to noncontrolling interest $ (100) $ (576) (130) $ (1,706)
PST Eletronicaltda [Member]        
Noncontrolling interest at beginning of period 14,489 13,370 13,762 13,310
Net loss attributable to noncontrolling interest (100) (576) (130) (1,706)
Foreign currency translation 69 1,377 826 2,567
Comprehensive income (loss) related to noncontrolling interest (31) 801 696 861
Acquisition of noncontrolling interest $ (14,458)   $ (14,458)  
Noncontrolling interest at end of period   $ 14,171   $ 14,171