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Supplemental Balance Sheet Information (Details Textual) (USD $) In Thousands, unless otherwise specified			6 Months Ended
	Jun. 30, 2012	Dec. 31, 2011	Jun. 30, 2012 PPT Division product materials and workmanship [Member]	Jun. 30, 2012 Filters and gratings products [Member]	Jun. 30, 2012 Original equipment manufacturer [Member] Maximum [Member]	Jun. 30, 2012 Original equipment manufacturer [Member] Minimum [Member]	Jun. 30, 2012 Lasers Division [Member] Maximum [Member]	Jun. 30, 2012 Lasers Division [Member] Minimum [Member]	Jun. 30, 2012 Ophir Division [Member]	Jun. 30, 2012 Laser beam profilers and dental CAD/CAM scanners [Member]
Product warranty (Textual) [Abstract]
Warranty term			one-year	90-day	19 months	15 months	Two Years	90 days	one-year	two-year
Short-term warranty obligations	$ 3,889	$ 4,342

Carrying value as of the balance sheet date of obligations incurred through that date and payable for estimated claims under standard and extended warranty protection rights granted to customers. For classified balance sheets, represents the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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