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Lease Information - Additional Information (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2019
USD ($)
a
lease
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Jan. 01, 2019
USD ($)
Operating Leased Assets [Line Items]        
Operating lease, term of contract (in years) 4 years 6 months      
Operating leases, earned overage rent revenue $ 1,300      
Operating leases, earned overage rent revenue   $ 1,200 $ 1,100  
Number of properties subject to lease | lease 9      
Area of land (in acres) | a 47      
Weighted-average remaining term of ground leases (in years) 52 years 2 months 12 days      
Rent expense $ 1,800      
Rent expense   1,700 $ 1,700  
Operating lease payments 1,700      
Operating lease liability $ 27,015 $ 0    
Incremental borrowing rate (as a percent) 5.86%      
Minimum        
Operating Leased Assets [Line Items]        
Extension option (in years) 5 years      
Length of extension option (in years) 20 years      
Incremental borrowing rate (as a percent) 3.93%      
Maximum        
Operating Leased Assets [Line Items]        
Extension option (in years) 10 years      
Length of extension option (in years) 25 years      
Incremental borrowing rate (as a percent) 6.33%      
Accounting Standards Update 2016-02        
Operating Leased Assets [Line Items]        
Rent expense $ 5,400      
Operating lease, right-of-use asset       $ 27,000
Operating lease liability       $ 27,300