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Facility Operating Leases
3 Months Ended
Mar. 31, 2012
Facility Operating Leases [Abstract]  
Facility Operating Leases [Abstract]
11.  Facility Operating Leases

A summary of facility lease expense and the impact of straight-line adjustment and amortization of deferred gains is as follows (dollars in thousands):

   
Three Months Ended March 31,
 
   
2012
  
2011
 
Cash basis payment
 $70,896  $65,682 
Straight-line expense
  1,642   1,726 
Amortization of deferred gain
  (1,093)  (1,093)
Facility lease expense
 $71,445  $66,315