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Commitments and Contingencies (Other Commitments) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Commitments and Contingencies Disclosure [Abstract]      
Operating lease expense $ 5,400 $ 4,400  
Operating lease expense     $ 5,000
Operating      
Year one 3,797 4,167  
Year two 6,756 1,803  
Year three 6,393 1,098  
Year four 6,309 728  
Year five 6,297 617  
Thereafter 496 1,447  
Total undiscounted cash flows 30,048 9,860  
Present value discount (3,771) (1,057)  
Other adjustments 23,795 25,379  
Lease liabilities 50,072 34,182  
Finance      
Year one 5,494 5,386  
Year two 5,604 5,494  
Year three 5,716 5,604  
Year four 5,830 5,716  
Year five 5,946 5,830  
Thereafter 1,567,826 1,573,824  
Total undiscounted cash flows 1,596,416 1,601,854  
Present value discount (1,445,896) (1,454,105)  
Other adjustments 0 0  
Lease liabilities 150,520 147,749  
Operating lease payments made 4,300 4,100  
Finance lease payments made $ 5,400 $ 3,300  
Operating leases, excluding tenant paid leases, weighted average lease term 5 years 7 months 6 days 4 years 2 months 12 days  
Operating leases, weighted average incremental borrowing rate, discount rate 5.00% 5.60%  
Finance leases, weighted average lease term 97 years 93 years  
Finance leases, weighted average rate implicit in the lease, discount rate 5.50% 5.40%