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Investments (Narrative) (Details) R$ in Thousands, $ in Thousands	3 Months Ended		6 Months Ended		64 Months Ended
	Jun. 30, 2019 USD ($)	Jun. 30, 2018 USD ($)	Jun. 30, 2019 USD ($)	Jun. 30, 2018 USD ($)	May 15, 2017	Jun. 30, 2019 BRL (R$)	Dec. 31, 2018 USD ($)	Dec. 31, 2018 BRL (R$)	Jun. 30, 2018 BRL (R$)	May 16, 2017
Schedule of Equity Method Investments [Line Items]
Income (loss) from equity method investments	$ 548	$ 665	$ 912	$ 1,186
MSIL
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership percentage	49.00%	49.00%	49.00%	49.00%		49.00%			49.00%
Equity method investments	$ 12,396		$ 12,396				$ 11,288
Income (loss) from equity method investments	548	$ 665	912	$ 1,186
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%
Dividends Payable, Price Index Adjustment	150	$ 108	150	$ 108		R$ 580			R$ 419
PST Eletronica Ltda [Member] | Noncontrolling interest
Schedule of Equity Method Investments [Line Items]
Dividends payable	6,175		6,175			R$ 23,783	5,980	R$ 23,204
Autotech Ventures [Member] | Venture Capital Funds [Member]
Schedule of Equity Method Investments [Line Items]
Investment commitment							10,000
Investment	1,653		$ 1,653				$ 437
Contribution expected period (in years)			10 years
Contribution by company	$ 1,200		$ 1,200

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