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Leases - Narrative (Details)
3 Months Ended 9 Months Ended
Sep. 30, 2021
USD ($)
lease
landlord_building
Sep. 30, 2020
USD ($)
Sep. 30, 2021
USD ($)
lease
landlord_building
Sep. 30, 2020
USD ($)
Dec. 31, 2020
USD ($)
Lessee, Lease, Description [Line Items]          
Sales-type lease, revenue $ 8,954,000   $ 24,124,000    
Rent abatement     $ 800,820,000    
Lessee, operating lease, number of leases not yet commenced | lease 15   15    
Lessee, operating lease, lease not yet commenced, construction costs $ 120,983,000   $ 120,983,000    
Construction advances $ 54,264,000   $ 54,264,000   $ 0
Lessee, operating lease, lease not yet commenced, term of contract 20 years   20 years    
Deemed Landlord Finance Lease          
Lessee, Lease, Description [Line Items]          
Number of deemed landlord financing leases that did not meet sale-leaseback criteria | lease     5    
Number of landlord buildings | landlord_building 13   13    
Finance lease, right-of-use asset, after accumulated amortization $ 375,139,000   $ 375,139,000    
Lessee, finance lease, term of contract 20 years   20 years    
Lease Commencing 2021          
Lessee, Lease, Description [Line Items]          
Lessee, operating lease, lease not yet commenced, undiscounted amount $ 83,000,000   $ 83,000,000    
COVID-19          
Lessee, Lease, Description [Line Items]          
Rent concession payable 6,722,000 $ 687,000 6,722,000 $ 687,000  
Rent abatement 0 $ 120,000 0 $ 1,431,000  
COVID-19 | Accrued expenses          
Lessee, Lease, Description [Line Items]          
Rent concession payable 670,000   670,000    
COVID-19 | Other long-term liabilities          
Lessee, Lease, Description [Line Items]          
Rent concession payable $ 6,052,000   $ 6,052,000