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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$ 171,449 $ 40,737 
2014  145,112   35,317 
2015  121,198   25,924 
2016  99,753   15,294 
2017  79,391   6,476 
Thereafter  810,548   398 
Total $ 1,427,451 $ 124,146