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Lease Agreements (Tables)
12 Months Ended
Dec. 31, 2011
Lease Agreements [Abstract]  
Future minimum non-cancelable base rent to be received
The future minimum non-cancelable base rent to be received under these operating leases for each of the years ending after December 31 is summarized as follows ($ in thousands):
 
  
Future
 
  
Minimum
 
  
Rent
 
 2012 $6,778 
 2013  6,772 
 2014  6,735 
 2015  5,404 
 2016  3,259 
Thereafter
  16,301 
  $45,249