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Investments (Schedule of Noncontrolling Interest) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2017
Net loss attributable to noncontrolling interest   $ (130)
PST Eletronica Ltda [Member]    
Noncontrolling interest at beginning of period 13,762
Net loss attributable to noncontrolling interest (130)
Foreign currency translation 826
Comprehensive income (loss) related to noncontrolling interest 696
Acquisition of noncontrolling interest (14,458)
Noncontrolling interest at end of period $ 0 $ 0