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Investments (Narrative) (Details) BRL in Thousands, $ in Thousands			12 Months Ended
	May 16, 2017 USD ($)	May 15, 2017	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2017 BRL	Dec. 31, 2017 USD ($)	May 16, 2017 BRL	May 16, 2017 USD ($)	Dec. 31, 2016 BRL	Dec. 31, 2016 USD ($)	Dec. 31, 2010
Schedule of Equity Method Investments [Line Items]
Income (loss) from equity method investments			$ 1,636	$ 1,233	$ 608
Noncontrolling interest														$ 13,762
Payments to Noncontrolling Interests			1,848
Fair value of the earn-out consideration			20,746
PST Eletronica Ltda [Member]
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership percentage															50.00%
Percentage ownership in consolidated subsidiary		74.00%		74.00%	74.00%	74.00%	74.00%	74.00%
Additional Percentage Of Noncontrolling Interest Acquired	26.00%
Noncontrolling interest					$ 13,310	$ 22,550						$ 14,458		13,762
Noncontrolling interest, (decrease) from distributions to noncontrolling interest holders			14,458
Dividends payable to noncontrolling interest									BRL 22,330	$ 6,742	BRL 9,610	3,092
Payments to Noncontrolling Interests	$ 1,500
Fair value of the earn-out consideration	$ 10,180
Dividends Payable Price Index Adjustment									BRL 1,879	$ 567			BRL 10,842	$ 3,327
PST Eletronica Ltda [Member] | Accumulated Foreign Currency Adjustment Attributable to Noncontrolling Interest [Member]
Schedule of Equity Method Investments [Line Items]
Noncontrolling interest												16,995
PST Eletronica Ltda [Member] | Additional Paid-In Capital [Member]
Schedule of Equity Method Investments [Line Items]
Noncontrolling interest												$ 31,453
Minda Stoneridge Instruments Ltd [Member]
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership percentage					49.00%				49.00%	49.00%			49.00%	49.00%
Equity method investments										$ 10,131				$ 7,952
Income (loss) from equity method investments			$ 1,636	$ 1,233	$ 608

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