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Investments (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Schedule of Equity Method Investments [Line Items]
Income (loss) from equity method investments	$ 143	$ 144	$ 332	$ 382
Noncontrolling interest	18,353		18,353		$ 22,550
Less: loss attributable to noncontrolling interest	$ (596)	(7,221)	(1,005)	(8,199)
PST Eletronicaltda [Member]
Schedule of Equity Method Investments [Line Items]
Percentage ownership in consolidated subsidiary	74.00%
Noncontrolling interest	$ 18,353	33,678	18,353	33,678
Foreign currency translation adjustments			(3,192)	2,337
Less: loss attributable to noncontrolling interest			1,005	8,199
Comprehensive income (loss) related to noncontrolling interest	$ 32	(6,230)	$ (4,197)	(5,862)
Minda Stoneridge Instruments Ltd [Member]
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership percentage	49.00%		49.00%
Equity method investments	$ 6,916		$ 6,916		$ 6,653
Income (loss) from equity method investments	$ 143	$ 144	$ 332	$ 382

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