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Commitments and Contingencies - Future Minimum Lease Payments to the Company Under Noncancelable Operating Leases (Details)
$ in Thousands
4 Months Ended 12 Months Ended
Dec. 31, 2017
USD ($)
Dec. 31, 2020
USD ($)
property
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Lessee, Lease, Description [Line Items]        
Related party lease revenue   $ 23,868 $ 196,695  
Operating Leases, Income Statement, Percentage Revenue   4,611 139,899  
Operating Leases, Income Statement, Minimum Lease Revenue   $ 19,257 56,796  
Number of Real Estate Properties | property   28    
2019   $ 69,532    
2020   51,750    
2021   0    
2022   0    
2023   0    
Thereafter (1)   0    
Total   121,282    
Land Lease [Member]        
Lessee, Lease, Description [Line Items]        
Operating Leases, Rent Expense, Net $ 16,600 7,200 10,200 $ 10,100
Operating Leases, Rent Expense, Minimum Rentals   6,600 6,600  
Operating Leases, Rent Expense, Contingent Rentals   $ 600 $ 3,600  
Number of Real Estate Properties | property   6    
Disposal Group, Not Discontinued Operations | Land Lease [Member]        
Lessee, Lease, Description [Line Items]        
Operating Leases, Rent Expense, Net       $ 6,500