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Commitments and Contingencies (Tables)
12 Months Ended
Dec. 31, 2011
Commitments and Contingencies Disclosure [Abstract]  
Lease Commitments
  Operating Leases Operating Leases Capital Leases
  Future Minimum  Future Minimum  Future Minimum 
  Rental Payments Rental Receipts Rental Payments
(Dollars in thousands)          
2012 $144,738 $37,699 $548 
2013  124,623  31,165  564 
2014  98,932  25,286  573 
2015  80,187  16,497  582 
2016  62,601  6,710  594 
Thereafter   695,895  925  5,305 
Total  $1,206,976 $118,282  8,166 
Less: Interest expense        (3,830)
Present value of minimum lease payments   4,336 
Less: Current portion of obligations under capital leases  (127)
Long-term portion of obligations under capital leases  $4,209