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Commitments and Contingencies (Narrative) (Details) R$ in Thousands	3 Months Ended		9 Months Ended		64 Months Ended
	Sep. 30, 2019 USD ($)	Sep. 30, 2018 USD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2018 USD ($)	May 15, 2017	Sep. 30, 2019 BRL (R$)	Sep. 30, 2019 USD ($)	Dec. 31, 2018 BRL (R$)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Short-term Debt [Line Items]
Environmental remediation accrued undiscounted liability							$ 106,000		$ 111,000
Loss recoveries and insurance gain contingencies										$ 1,644,000
Product warranty and recall accrual							3,071,000		3,283,000
Gain on Business Interruption Insurance Recovery	$ 0	$ 0	$ 0	$ 0
Cash proceeds related to damaged inventory and incremental costs			0	241,000
Cash proceeds within cash flows from investing activities				1,403,000
Insurance recoveries	$ 0	$ 0	0	$ 0
Selling, General and Administrative Expenses [Member]
Short-term Debt [Line Items]
Gain on litigation			6,473,000
Interest Income [Member]
Short-term Debt [Line Items]
Gain on litigation			2,392,000
Professional Fees [Member]
Short-term Debt [Line Items]
Gain on litigation			$ 990,000
Letter of Credit [Member]
Short-term Debt [Line Items]
Line of credit							1,489,000
PST Eletronica Ltda [Member]
Short-term Debt [Line Items]
Percentage ownership in consolidated subsidiary					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$ 31,200	$ 7,500,000	R$ 29,700	$ 7,600,000

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Undiscounted amount of the accrual for environmental loss contingencies.

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