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Commitments and Contingencies (Tables)
12 Months Ended
Dec. 31, 2013
Commitments and Contingencies Disclosure [Abstract]  
Lease Commitments
 Operating Leases Future Minimum Rental Payments Operating Leases Future Minimum Rental Receipts
(Dollars in thousands)     
2014$152,349 $46,357
2015 134,852  36,847
2016 116,397  26,201
2017 97,098  17,226
2018 79,166  6,521
Thereafter  783,730  227
Total $1,363,592 $133,379