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Summary of Significant Accounting Policies (Narrative) (Details)
 12 Months Ended
Nov. 25, 2020
Dec. 31, 2021
USD ($)
Segment
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2017
shares
May 01, 2019
shares
Apr. 30, 2019
shares
Jan. 01, 2019
USD ($)
Summary Of Significant Accounting Policies [Line Items]                
VIE real estate owned carrying value   $ 1,288,524,000 $ 1,527,478,000 $ 1,515,206,000        
Mortgage loan payable   156,821,000 45,385,000          
Depreciation expense   36,300,000 43,600,000 41,800,000        
Cash at consolidated joint ventures   200,000 200,000          
Uncollectible lease rental revenue   700,000 8,300,000 2,400,000        
Deferred rent receivables written-off   200,000 1,400,000 300,000        
Allowance for doubtful accounts receivable   2,200,000 1,400,000          
Provision for doubtful accounts included in operating, maintenance and management expenses   $ 1,100,000 1,500,000 400,000        
Number of reportable segment | Segment   1            
Operating lease, right-of-use asset   $ 9,861,000 13,828,000         $ 14,600,000
Operating lease, right-of-use liability   10,220,000           $ 14,600,000
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration]               Other assets and deferred charges, net
Operating Lease Liability Statement Of Financial Position Extensible List               us-gaap:AccountsPayableAndAccruedLiabilitiesMember
Operating lease cost       2,800,000        
Adjustment to opening equity prior period       $ 500,000        
Lease rent deferred   3,500,000 3,500,000          
Lease rent deferrals continued to recognize rental income   2,400,000 2,400,000          
Lease rent waived   $ 2,400,000 $ 2,400,000          
2017 Stock Incentive Plan [Member]                
Summary Of Significant Accounting Policies [Line Items]                
Maximum number of shares may be issued under the plan | shares           909,000 303,000  
Maximum number of shares to be granted per year to a participant | shares         76,000      
Minimum [Member]                
Summary Of Significant Accounting Policies [Line Items]                
Real estate investments useful life   3 years            
Maximum [Member]                
Summary Of Significant Accounting Policies [Line Items]                
Real estate investments useful life   40 years            
Variable Interest Entity, Primary Beneficiary [Member] | Other Ownership Interest [Member]                
Summary Of Significant Accounting Policies [Line Items]                
VIE real estate owned carrying value   $ 36,200,000            
Mortgage loan payable   $ 0            
Crossroads II [Member] | Variable Interest Entity, Primary Beneficiary [Member] | Other Ownership Interest [Member]                
Summary Of Significant Accounting Policies [Line Items]                
Ownership percentage   60.00%            
Common Stock [Member]                
Summary Of Significant Accounting Policies [Line Items]                
Stockholders' equity, reverse stock split, conversion ratio 0.15              
Stockholders' equity, reverse stock split   Each 6.6 shares of the Company's issued and outstanding common stock were combined into one share of the Company's common stock.