Acquisition (Details) (Airinmar, USD $) In Thousands, unless otherwise specified	Nov. 30, 2011 Y	Oct. 11, 2011
Airinmar
Acquisition
Estimated purchase consideration		$ 43,500
Cash consideration paid		23,200
Potential earn-out payment		20,300
Period over which EBITDA levels will be measured (in years)	2
Estimated liability of the acquisition date fair value of the earn-out	20,300
Preliminary purchase price allocation
Cash	3,700
Accounts receivable	8,000
Prepaid expenses	600
Property, plant and equipment	600
Goodwill and identified intangibles	42,400
Accounts payable	(6,700)
Accrued liabilities	$ (25,400)