Annual report pursuant to Section 13 and 15(d)

Related Party Transactions (Narrative) (Details)

v3.22.0.1
Related Party Transactions (Narrative) (Details)
1 Months Ended 12 Months Ended
Sep. 30, 2020
USD ($)
item
Dec. 31, 2021
USD ($)
ft²
property
item
Dec. 31, 2020
USD ($)
ft²
Dec. 31, 2019
USD ($)
Related Party Transaction [Line Items]        
Area Of Real Estate Property | ft²   3,049,313 2,725,639  
Revenue from leases   $ 282,791,000 $ 272,970,000 $ 302,409,000
Reimbursement expense $ 6,100,000      
General and administrative   57,198,000 71,058,000 59,805,000
Number of payments | item 3      
Marshall [Member]        
Related Party Transaction [Line Items]        
Due from related parties   84,000 99,000  
Due to related party, Current       120,000
Accounts payable to related parties   0 0  
RG [Member]        
Related Party Transaction [Line Items]        
Related party revenue   0 0 674,000
Bow Street LLC [Member]        
Related Party Transaction [Line Items]        
Reimbursement expense $ 6,100,000      
General and administrative $ 6,100,000 $ 6,100,000    
Number of payments | item   3    
Leased Office Space 1 [Member] | Mack [Member]        
Related Party Transaction [Line Items]        
Area Of Real Estate Property | ft²   5,930    
Number of real estate properties | property   1    
Lease expiration date   January 2025    
Leased Property [Member]        
Related Party Transaction [Line Items]        
Number of real estate properties | property   1    
Leased Property [Member] | Mack [Member]        
Related Party Transaction [Line Items]        
Area Of Real Estate Property | ft²   7,034    
Revenue from leases     48,000 $ 18,000
Accounts Receivable, Related Parties, Current   $ 0 $ 0