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Commitments and Contingencies (Other Commitments) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Commitments and Contingencies Disclosure [Abstract]      
Operating lease expense $ 4,400 $ 5,000 $ 5,200
Operating      
2020 4,167    
2021 1,803    
2022 1,098    
2023 728    
2024 617    
Thereafter 1,447    
Total undiscounted cash flows 9,860    
Present value discount (1,057)    
Other adjustments 25,379    
Lease liabilities 34,182    
Finance      
2020 5,386    
2021 5,494    
2022 5,604    
2023 5,716    
2024 5,830    
Thereafter 1,573,824    
Total undiscounted cash flows 1,601,854    
Present value discount (1,454,105)    
Other adjustments 0    
Lease liabilities 147,749    
Operating lease payments made 4,100    
Finance lease payments made $ 3,300    
Operating leases, excluding tenant paid leases, weighted average lease term (in years) 4 years 2 months 12 days    
Operating leases, weighted average incremental borrowing rate, discount rate (percent) 5.60%    
Finance leases, weighted average lease term (in years) 93 years    
Finance leases, weighted average rate implicit in the lease, discount rate (percent) 5.40%    
Operating      
2019   4,340  
2020   4,016  
2021   1,589  
2022   991  
2023   849  
Thereafter   $ 2,469