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Investments (Narrative) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended			0 Months Ended	12 Months Ended					12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2011 PST Eletronicaltda [Member]	Dec. 31, 2013 PST Eletronicaltda [Member]	Dec. 31, 2012 PST Eletronicaltda [Member]	Dec. 31, 2011 PST Eletronicaltda [Member]	Dec. 30, 2011 PST Eletronicaltda [Member]	Dec. 31, 2010 PST Eletronicaltda [Member]	Dec. 31, 2013 Minda Stoneridge Instruments Ltd [Member]	Dec. 31, 2012 Minda Stoneridge Instruments Ltd [Member]	Dec. 31, 2011 Minda Stoneridge Instruments Ltd [Member]
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership percentage																50.00%	50.00%	49.00%	49.00%	49.00%
Percentage ownership in consolidated subsidiary												74.00%	74.00%	74.00%
Equity method investments												$ 104,118			$ 104,118	$ 38,746		$ 5,981	$ 6,215
Income (loss) from equity method investments									476	760	10,034				8,805			476	760	1,229
Noncontrolling interest	39,540				44,081				39,540	44,081			39,540	44,076
Noncontroling interest decrease											397		4,537	4,651
Foreign currency translation adjustments													5,706	3,918
Dividend from noncontrolling interest													212
Net income (loss) attributable to noncontrolling interests	117	466	634	160	90	170	(1,740)	(133)	1,377	(1,613)	(3,820)		(1,381)	733
Comprehensive loss related to noncontrolling interest									$ 1,377	$ (1,613)	$ (3,820)		$ 4,325	$ 4,651

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