Property, Plant and Equipment (Tables)

12 Months Ended

Dec. 31, 2012

Property, Plant and Equipment [Abstract]

Schedule of property, plant and equipment

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

	2011			2012
Land	$	4,367		$	4,243
Building and improvements	90,360			92,775
Machinery and equipment	163,923			176,102
Construction in progress	6,310			5,508
	264,960			278,628
Less:  Accumulated depreciation	(125,773		)	(139,587		)
	$	139,187		$	139,041

Schedule of aggregate future minimum lease commitments for operating leases

The aggregate future minimum lease commitments for operating leases at December 31, 2012 are as follows:

2013	$	7,128
2014	5,787
2015	5,001
2016	3,531
2017	3,275
Thereafter	8,027