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Investments (Narrative) (Details) R$ in Thousands, $ in Thousands		3 Months Ended		65 Months Ended
	May 16, 2017 USD ($)	Mar. 31, 2018 USD ($)	Mar. 31, 2017 USD ($)	May 15, 2017	Mar. 31, 2018 BRL (R$)	Mar. 31, 2018 USD ($)	Dec. 31, 2017 BRL (R$)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Schedule of Equity Method Investments [Line Items]
Income (loss) from equity method investments		$ 521	$ 180
PST Eletronica Ltda [Member]
Schedule of Equity Method Investments [Line Items]
Percentage ownership in consolidated subsidiary				74.00%
Percentage of additional noncontrolling interest acquired	26.00%
Noncontrolling interest	$ 14,458		14,489						$ 13,762
Dividends payable, price index adjustment					R$ 249	$ 75
PST Eletronica Ltda [Member] | Noncontrolling Interest [Member]
Schedule of Equity Method Investments [Line Items]
Cash payment at closing	1,500
Fair value of earn-out liability	10,180
Carrying value of investment	31,453
Carrying value of foreign currency translation	$ (16,995)
Dividends payable					R$ 22,579	$ 6,833	R$ 22,330	$ 6,742
Minda Stoneridge Instruments Ltd [Member]
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership percentage					49.00%	49.00%
Equity method investments						$ 10,452		$ 10,131
Income (loss) from equity method investments		$ 521	$ 180

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