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Investments (Narrative) (Details) BRL in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016 USD ($)	Sep. 30, 2015 USD ($)	Sep. 30, 2016 USD ($)	Sep. 30, 2015 USD ($)	Sep. 30, 2016 BRL	Sep. 30, 2016 USD ($)	Dec. 31, 2015 USD ($)
Schedule of Equity Method Investments [Line Items]
Income (loss) from equity method investments	$ 307	$ 160	$ 603	$ 492
Noncontrolling interest						$ 13,704	$ 13,310
Less: Net loss attributable to noncontrolling interest	(303)	(69)	$ (2,009)	(1,074)
PST Eletronica Ltda [Member]
Schedule of Equity Method Investments [Line Items]
Percentage ownership in consolidated subsidiary			74.00%
Noncontrolling interest		14,273		14,273		13,704
Foreign currency translation adjustments			$ 2,403	(7,203)
Less: Net loss attributable to noncontrolling interest			(2,009)	(1,074)
Comprehensive income (loss) related to noncontrolling interest	(467)	(4,080)	394	(8,277)
Dividends payable					BRL 10,842	$ 3,340
Minda Stoneridge Instruments Ltd [Member]
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership percentage					49.00%	49.00%
Equity method investments						$ 7,846	$ 6,929
Income (loss) from equity method investments	$ 307	$ 160	$ 603	$ 492

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Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income (loss) and other comprehensive income (loss), attributable to noncontrolling interests. Excludes changes in equity resulting from investments by owners and distributions to owners.

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