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Facility Operating Leases (Tables)
12 Months Ended
Dec. 31, 2011
Facility Operating Leases [Abstract]  
Summary of facility operating leases
A summary of facility lease expense and the impact of straight-line adjustment and amortization of deferred gains are as follows (dollars in thousands):

   
For the Years Ended
December 31,
 
   
2011
  
2010
  
2009
 
Cash basis payment
 $270,623  $264,727  $260,590 
Straight-line expense
  8,608   10,521   15,851 
Amortization of deferred gain
  (4,373)  (4,343)  (4,345)
Facility lease expense
 $274,858  $270,905  $272,096