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Commitments and Contingencies (Tables)
12 Months Ended
Dec. 31, 2011
Commitments and Contingencies [Abstract]  
Minimum rentals for aggregate lease commitments
The minimum rentals for aggregate lease commitments as of December 31, 2011, were as follows:

2012
 $7,937 
2013
  4,628 
2014
  2,811 
2015
  1,622 
2016
  774 
Thereafter
  857 
Total
 $18,629