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Investments (Narrative) (Details) BRL in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2017 USD ($)	Mar. 31, 2016 USD ($)	Mar. 31, 2017 BRL	Mar. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Schedule of Equity Method Investments [Line Items]
Income (loss) from equity method investments	$ 180	$ 143
Noncontrolling interest				$ 14,489	$ 13,762
Less: Net loss attributable to noncontrolling interest	$ (30)	(1,130)
PST Eletronicaltda [Member]
Schedule of Equity Method Investments [Line Items]
Percentage ownership in consolidated subsidiary	74.00%
Noncontrolling interest		13,370		14,489
Foreign currency translation adjustments	$ 757	1,190
Less: Net loss attributable to noncontrolling interest	(30)	(1,130)
Comprehensive income (loss) related to noncontrolling interest	727	60
Dividends payable			BRL 10,842	$ 3,472
Minda Stoneridge Instruments Ltd [Member]
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership percentage			49.00%	49.00%
Equity method investments				$ 8,514	$ 7,952
Income (loss) from equity method investments	$ 180	$ 143

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