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Investments (Narrative) (Details) R$ in Thousands, $ in Thousands		3 Months Ended		9 Months Ended		65 Months Ended
	May 16, 2017 USD ($)	Sep. 30, 2018 USD ($)	Sep. 30, 2017 USD ($)	Sep. 30, 2018 USD ($)	Sep. 30, 2017 USD ($)	May 15, 2017	Sep. 30, 2018 BRL (R$)	Sep. 30, 2018 USD ($)	Dec. 31, 2017 BRL (R$)	Dec. 31, 2017 USD ($)	Jun. 30, 2017 USD ($)	Dec. 31, 2016 USD ($)
Schedule of Equity Method Investments [Line Items]
Income (loss) from equity method investments		$ 249	$ 465	$ 1,435	$ 1,200
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		0		0							$ 13,762
Dividends payable, price index adjustment							R$ 766	$ 189
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$ 23,096	$ 5,706	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								$ 10,218		$ 10,131
Income (loss) from equity method investments		249	465	1,435	1,200
Earnout Consideration [Member] | PST Eletronica Ltda [Member]
Schedule of Equity Method Investments [Line Items]
Expense related to fair value adjustment for earn-out consideration		$ 501	$ 475	$ 1,549	$ 719

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