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Investments (Schedule of Noncontrolling Interest) (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2017
USD ($)
Net loss attributable to noncontrolling interest $ (30)
PST Eletronica Ltda [Member]  
Noncontrolling interest at beginning of period 13,762
Net loss attributable to noncontrolling interest (30)
Foreign currency translation 757
Comprehensive income (loss) related to noncontrolling interest 727
Noncontrolling interest at end of period $ 14,489