Property, Plant and Equipment (Tables)

12 Months Ended

Dec. 31, 2011

Property, Plant and Equipment [Abstract]

Schedule of property, plant and equipment

Property, plant and equipment consist of the following at December 31,:

	2010			2011
Land	$	4,486		$	4,367
Building and improvements	95,923			90,360
Machinery and equipment	161,635			163,923
Construction in progress	5,198			6,310
	267,242			264,960
Less:  Accumulated depreciation	(126,347		)	(125,773		)
	$	140,895		$	139,187

Schedule of aggregate future minimum lease commitments for operating leases

The aggregate future minimum lease commitments for operating leases at December 31, 2011 are as follows:

2012	$	6,291
2013	5,389
2014	4,321
2015	2,621
2016	2,700
Thereafter	7,578