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Investments (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Schedule of Equity Method Investments [Line Items]
Income (loss) from equity method investments	$ 160	$ 205	$ 492	$ 587
Noncontrolling interest	14,273		14,273		$ 22,550
Less: income (loss) attributable to noncontrolling interest	$ (69)	1,160	(1,074)	(7,039)
PST Eletronicaltda [Member]
Schedule of Equity Method Investments [Line Items]
Percentage ownership in consolidated subsidiary	74.00%
Noncontrolling interest	$ 14,273	31,383	14,273	31,383
Foreign currency translation adjustments			(7,203)	(1,118)
Less: income (loss) attributable to noncontrolling interest			(1,074)	(7,039)
Comprehensive income (loss) related to noncontrolling interest	$ (4,080)	(2,294)	$ (8,277)	(8,157)
Minda Stoneridge Instruments Ltd [Member]
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership percentage	49.00%		49.00%
Equity method investments	$ 6,872		$ 6,872		$ 6,653
Income (loss) from equity method investments	$ 160	$ 205	$ 492	$ 587

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