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Investment and Joint Venture (Details Textual) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012
Income (Loss) From Equity Method Investments	$ 201	$ 139
Noncontrolling interest	44,677		44,081
Net loss attributable to noncontrolling interest	160	(133)
Pst Eletronica Ltda [Member]
Noncontrolling Interest, Ownership Percentage by Parent	74.00%	74.00%	74.00%
Noncontrolling Interest, Period Increase (Decrease)	601
Noncontrolling interest	44,677
Noncontrolling Interest Increase Due To Change In Foreign Currency Translation	647
Net loss attributable to noncontrolling interest	165
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders	211
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Noncontrolling Interest	812	1,475
Minda Stoneridge Instruments Ltd [Member]
Income (Loss) From Equity Method Investments	201	139
Equity Method Investment, Ownership Percentage	49.00%	49.00%
Equity Method Investments	$ 6,497		$ 6,215

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