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Investments (Narrative) (Details) BRL in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2016 USD ($)	Mar. 31, 2015 USD ($)	Mar. 31, 2016 BRL	Mar. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)
Schedule of Equity Method Investments [Line Items]
Income (loss) from equity method investments	$ 143	$ 189
Noncontrolling interest				$ 13,370	$ 13,310
Less: income (loss) attributable to noncontrolling interest	$ (1,130)	(409)
PST Eletronicaltda [Member]
Schedule of Equity Method Investments [Line Items]
Percentage ownership in consolidated subsidiary	74.00%
Noncontrolling interest		18,321		13,370
Foreign currency translation adjustments	$ 1,190	(3,820)
Less: income (loss) attributable to noncontrolling interest	(1,130)	(409)
Comprehensive income (loss) related to noncontrolling interest	60	(4,229)
Dividends payable			BRL 10,842	$ 3,046
Minda Stoneridge Instruments Ltd [Member]
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership percentage			49.00%	49.00%
Equity method investments				$ 7,067	$ 6,929
Income (loss) from equity method investments	$ 143	$ 189