Estimated Fair Values of Assets Acquired and Liabilities Assumed for Drake Acquisition (Details) (USD $) In Thousands, unless otherwise specified	Sep. 05, 2012 as initially reported	Dec. 02, 2011 Drake	Dec. 02, 2011 Drake as initially reported	Dec. 02, 2011 Drake Measurement Period Adjustments
Business Acquisition [Line Items]
Cash		$ 427	$ 427	$ 0
Current assets		4,245	4,245	0
Deferred tax asset		390	390	0
Property, plant and equipment		1,773	1,773	0
Goodwill		15,640	15,237	403
Other intangibles		5,810	5,810	0
Other assets		9	9	0
Current liabilities		(3,334)	(3,334)	0
Long-term deferred tax liability		(2,395)	(2,395)	0
Net assets acquired and liabilities assumed	$ 32,000	$ 22,565	$ 22,162	$ 403