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Leases (Tables)
12 Months Ended
Dec. 31, 2011
Leases [Abstract]  
Summary of minimum annual rental payments
         

2012

  $ 145,491  

2013

  $ 125,635  

2014

  $ 111,981  

2015

  $ 92,917  

2016

  $ 79,859  

Thereafter

  $ 534,461