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Fair Value Measurements (Details)
$ in Thousands
Sep. 30, 2020
USD ($)
item
Dec. 31, 2019
USD ($)
item
Fair value measurements    
Mortgage loans receivable $ 257,671 $ 254,099
Senior unsecured notes, net of debt issue costs $ 574,444 $ 599,488
Level 3 | Senior Unsecured Notes maturing before 2026 | Discount Rate    
Fair value measurements    
Future cash outflows discount rate (as a percent) | item 0.0375 0.0370
Level 3 | Senior Unsecured Notes maturing 2026 and after | Discount Rate    
Fair value measurements    
Future cash outflows discount rate (as a percent) | item 0.0400 0.0390
Level 3 | Mortgage Loans Receivable | Discount Rate    
Fair value measurements    
Future cash inflows discount rate (as a percent) | item 0.100 0.090
Carrying Value    
Fair value measurements    
Mortgage loans receivable $ 257,671 $ 254,099
Bank borrowings 89,900 93,900
Senior unsecured notes, net of debt issue costs 574,444 599,488
Fair Value    
Fair value measurements    
Bank borrowings 89,900 93,900
Fair Value | Level 3    
Fair value measurements    
Mortgage loans receivable 299,151 312,824
Senior unsecured notes, net of debt issue costs $ 582,480 $ 612,375