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Commitments and Contingencies (Tables)
12 Months Ended
Dec. 31, 2012
Commitments and Contingencies Disclosure [Abstract]  
Lease Commitments
  Operating Leases Future Minimum Rental Payments Operating Leases Future Minimum Rental Receipts 
(Dollars in thousands)      
2013$151,630 $41,184 
2014 127,081  35,613 
2015 108,779  26,088 
2016 90,919  15,358 
2017 73,969  6,505 
Thereafter  809,344  398 
Total $1,361,722 $125,146