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Leases (Schedule Of Future Minimum Lease Payments Under Non-Cancelable Operating Leases) (Details)
$ in Thousands
Dec. 31, 2017
USD ($)
Operating Leased Assets [Line Items]  
2018 $ 31,609
2019 31,554
2020 26,675
2021 26,407
2022 7,840
Thereafter 206,733
Total minimum lease payments 330,818
Ground Lease [Member]  
Operating Leased Assets [Line Items]  
2018 3,629
2019 3,717
2020 2,792
2021 2,730
2022 2,771
Thereafter 20,823
Total minimum lease payments 36,462
Premises Lease [Member]  
Operating Leased Assets [Line Items]  
2018 27,980
2019 27,837
2020 23,883
2021 23,677
2022 5,069
Thereafter 185,910
Total minimum lease payments $ 294,356