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Commitments and Contingencies (Tables)
12 Months Ended
Dec. 31, 2011
Disclosure- Commitments and Contingencies [Abstract]  
Lease arrangements
 Period  Amount     
          
 2012 $34,737     
 2013  28,603     
 2014  23,594     
 2015  18,827     
 2016  18,776     
 2017 through 2019  23,818     
          
 Total future minimum rental payments  $148,355