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Commitments and Contingencies (Tables)
12 Months Ended
Dec. 31, 2012
Disclosure- Commitments and Contingencies [Abstract]  
Lease arrangements
 Period  Amount 
      
 2013 $29,982 
 2014  26,546 
 2015  21,793 
 2016  21,436 
 2017  21,090 
 2018 through 2019  7,611 
      
 Total future minimum rental payments  $128,458