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Investments (Narrative) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		12 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013
Schedule of Equity Method Investments [Line Items]
Percentage ownership in consolidated subsidiary	74.00%
Income (loss) from equity method investments	$ 238	$ 201
Noncontrolling interest	39,907		39,540
Net income (loss) attributable to noncontrolling interests	(978)	160
Comprehensive income related to noncontrolling interest	(978)	160
PST Eletronicaltda [Member]
Schedule of Equity Method Investments [Line Items]
Percentage ownership in consolidated subsidiary	74.00%		74.00%
Noncontrolling interest	39,907	44,677
Noncontroling interest decrease	367	601
Foreign currency translation adjustments	(1,345)	(647)
Dividend from noncontrolling interest		211
Net income (loss) attributable to noncontrolling interests	978	(165)
Comprehensive income related to noncontrolling interest	(367)	(812)
Minda Stoneridge Instruments Ltd [Member]
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership percentage	49.00%		49.00%
Equity method investments	6,417		5,981
Income (loss) from equity method investments	$ 238	$ 201

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