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Commitments and Contingencies - Other Commitments (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2019
Dec. 31, 2018
Commitments and Contingencies Disclosure [Abstract]      
Operating lease payments made $ 1,000 $ 2,000  
Finance lease payments made $ 700 $ 900  
Operating leases, excluding tenant paid leases, weighted average lease term (in years)   4 years 4 months 24 days  
Operating leases, weighted average incremental borrowing rate, discount rate (percent) 5.60% 5.60%  
Finance leases, weighted average lease term (in years) 97 years 8 months 12 days 97 years 8 months 12 days  
Finance leases, weighted average rate implicit in the lease, discount rate (percent) 5.70% 5.70%  
Future Minimum Operating Lease Obligations      
2019 $ 2,147 $ 2,147  
2020 4,054 4,054  
2021 1,468 1,468  
2022 869 869  
2023 728 728  
Thereafter 2,074 2,074  
Total undiscounted cash flows 11,340 11,340  
Present value discount (1,586) (1,586)  
Other adjustments 19,163 19,163  
Operating lease liabilities 28,917 28,917  
Future Minimum Finance Lease Obligations      
2019 1,295 1,295  
2020 2,633 2,633  
2021 2,686 2,686  
2022 2,740 2,740  
2023 2,794 2,794  
Thereafter 759,082 759,082  
Total undiscounted cash flows 771,230 771,230  
Present value discount (702,659) (702,659)  
Finance lease liabilities $ 68,571 $ 68,571  
Future Minimum Operating Lease Obligations at Prior Year End      
2019     $ 4,340
2020     4,016
2021     1,589
2022     991
2023     849
Thereafter     $ 2,469