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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$ 175,140 $ 45,911
2015  153,338   36,536
2016  131,670   25,993
2017  109,733   17,083
2018  91,275   6,478
Thereafter  849,015   227
Total $ 1,510,171 $ 132,228