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Commitments and Contingencies (Narrative) (Details) R$ in Thousands, $ in Thousands				1 Months Ended	3 Months Ended	12 Months Ended							60 Months Ended
	May 15, 2017	May 15, 2017	Dec. 31, 2011	Apr. 30, 2017	Mar. 31, 2017	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2016	Dec. 31, 2018 BRL (R$)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 BRL (R$)	Dec. 31, 2017 USD ($)
Short-term Debt [Line Items]
Product warranty and recall accrual															$ 3,283		$ 3,112
Cash proceeds related to damaged inventory and incremental costs						$ 241	$ 500
Cash proceeds within cash flows from investing activities						1,403	711
Estimated insurance recoveries																	1,644
Cost of Goods Sold [Member]
Short-term Debt [Line Items]
Insurance recoveries							189
Selling, General and Administrative Expenses [Member]
Short-term Debt [Line Items]
Gain on Business Interruption Insurance Recovery						$ 0
Insurance recoveries							$ 1,923
Control Devices [Member]
Short-term Debt [Line Items]
Environmental remediation accrued undiscounted liability															111		265
Accrued Expenses and Other Current Liabilities [Member] | Control Devices [Member]
Short-term Debt [Line Items]
Environmental remediation accrued undiscounted liability															111		253
Letter of Credit [Member] | Control Devices [Member]
Short-term Debt [Line Items]
Line of credit															1,489
PST Eletronica Ltda [Member]
Short-term Debt [Line Items]
Percentage ownership in consolidated subsidiary	74.00%	74.00%	74.00%	74.00%	74.00%			74.00%	74.00%	74.00%	74.00%	74.00%	74.00%
PST Eletronica Ltda [Member] | Civil, labor and other tax contingencies [Member]
Short-term Debt [Line Items]
Loss contingency, estimate of possible loss														R$ 29,700	$ 7,600	R$ 33,800	$ 10,200

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Undiscounted amount of the accrual for environmental loss contingencies.

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