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Commitments and Contingencies (Tables)
12 Months Ended
Dec. 31, 2011
Commitments and Contingencies [Abstract]  
Future non-cancelable purchase and service obligations
At December 31, 2011 future non-cancelable purchase and service obligations greater than $100,000 and one year were as follows (in thousands):
 
2012
 $4,737 
2013
  3,721 
2014
  2,638 
2015
  2,426 
2016
  1,652 
Thereafter
  6,520 
Total obligations
 $21,694