Acquisitions (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	May 31, 2011
Business Acquisition [Line Items]
Date of acquisition	May 31, 2011
Total purchase price		$ 4,456
Cash paid as part of purchase price	2,956
Number of payments to be made in future in acquisition	2
Amount of each installment payments		750
Purchase price allocation [Abstract]
Current Assets		426
Property, plant and equipment, net		167
Identified Intangible Assets		3,800
Goodwill		472
Total Assets Acquired		4,865
Current Liabilities		409
Total Liabilities Assumed		409
Net Assets Acquired		$ 4,456