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Commitments and Contingencies (Tables)
12 Months Ended
Dec. 31, 2011
Commitments and Contingencies [Abstract]  
Operating Lease Obligations
The Company leases certain of its manufacturing facilities under noncancelable operating leases expiring at various dates through December 2016. The Company incurred rental expense under these leases of $3.7 million, $3.3 million and $3.3 million for the years ended 2011, 2010 and 2009, respectively. The approximate minimum rental commitments required under existing noncancelable leases as of December 31, 2011 are as follows (in thousands):

2012
 $3,328 
2013
  2,381 
2014
  1,137 
2015
  524 
2016
  364 
Thereafter
  761 
   $8,495