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Investments (Narrative) (Details) BRL in Thousands, $ in Thousands		3 Months Ended		9 Months Ended		64 Months Ended	65 Months Ended
	May 16, 2017 USD ($)	Sep. 30, 2017 USD ($)	Sep. 30, 2016 USD ($)	Sep. 30, 2017 USD ($)	Sep. 30, 2016 USD ($)	May 15, 2017	May 15, 2017	Sep. 30, 2017 BRL	Sep. 30, 2017 USD ($)	May 16, 2017 BRL	May 16, 2017 USD ($)	Dec. 31, 2016 USD ($)	Jun. 30, 2016 USD ($)	Dec. 31, 2015 USD ($)
Schedule of Equity Method Investments [Line Items]
Cash payment at closing				$ 1,848
Noncontrolling interest												$ 13,762
Income (loss) from equity method investments		$ 465	$ 307	1,200	$ 603
PST Eletronicaltda [Member]
Schedule of Equity Method Investments [Line Items]
Percentage ownership in consolidated subsidiary						74.00%	74.00%
Percentage of additional noncontrolling interest acquired										26.00%	26.00%
Noncontrolling interest			13,704		13,704						$ 14,458	13,762	$ 14,171	$ 13,310
Dividends payable								BRL 22,143	$ 7,004	BRL 9,610	3,092
Dividends Payable, Price Index Adjustment								BRL 1,691	$ 535
PST Eletronicaltda [Member] | Noncontrolling Interest [Member]
Schedule of Equity Method Investments [Line Items]
Cash payment at closing	$ 1,500
Fair value of earn-out liability	$ 10,400	10,180
Carrying value of investment											31,453
Carrying value of foreign currency translation											$ (16,995)
Minda Stoneridge Instruments Ltd [Member]
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership percentage								49.00%	49.00%
Equity method investments									$ 9,475			$ 7,952
Income (loss) from equity method investments		$ 465	$ 307	$ 1,200	$ 603

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