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Goodwill (Details) (USD $)	1 Months Ended	12 Months Ended					12 Months Ended
	Oct. 31, 2011	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2011 MVSD [Member]	Dec. 31, 2010 MVSD [Member]	Oct. 02, 2011 MVSD [Member]	Dec. 31, 2011 SISD [Member]	Dec. 31, 2010 SISD [Member]	Oct. 02, 2011 SISD [Member]
Changes in the carrying value of goodwill
Goodwill, Beginning Balance		$ 82,204,000	$ 82,604,000	$ 77,642,000	$ 77,840,000		$ 4,562,000	$ 4,764,000
Foreign currency exchange rate changes		(175,000)	(400,000)	(86,000)	(198,000)		(89,000)	(202,000)
Goodwill, Ending Balance		82,029,000	82,204,000	77,556,000	77,642,000		4,473,000	4,562,000
Goodwill (Textual) [Abstract]
Impairment charges	$ 0
Fair value in excess to carrying value						208.00%			119.00%

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Carrying amount as of the balance sheet date, which is the cumulative amount paid and (if applicable) the fair value of any noncontrolling interest in the acquiree, adjusted for any amortization recognized prior to the adoption of any changes in generally accepted accounting principles (as applicable) and for any impairment charges, in excess of the fair value of net assets acquired in one or more business combination transactions.

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Loss recognized during the period that results from the write-down of goodwill after comparing the implied fair value of reporting unit goodwill with the carrying amount of that goodwill. Goodwill is assessed at least annually for impairment.

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The increase (decrease) to the recorded value of goodwill for foreign currency translation adjustments.

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