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Commitments and Contingencies (Narrative) (Details) R$ 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$)	Dec. 31, 2017 USD ($)
Short-term Debt [Line Items]
Environmental remediation accrued undiscounted liability	$ 85,000		$ 85,000				$ 111,000
Loss recoveries and insurance gain contingencies									$ 1,644,000
Product warranty and recall accrual	3,132,000		3,132,000				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			0	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		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	$ 5,000,000		$ 5,000,000			R$ 19,100	$ 7,600,000	R$ 29,700

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