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Related Party Transactions (Tables)
 12 Months Ended
Dec. 31, 2011
Related Party Transactions [Abstract]  
Rent expense associated with leases
The table below presents rent expense associated with these leases for the past three years (in thousands):

   
2011
   
2010
   
2009
NCC
$
923
 
$
835
 
$
819
Other
 
405
   
469
   
461
Total
$
1,328
 
$
1,304
 
$
1,280