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Fair Value Measurements (Details)
$ in Thousands
Jun. 30, 2019
USD ($)
item
Dec. 31, 2018
USD ($)
item
Fair value measurements    
Mortgage loans receivable $ 252,016 $ 242,939
Senior unsecured notes, net of debt issue costs $ 528,938 $ 533,029
Level 3 | Senior Unsecured Notes maturing before 2026 | Discount Rate    
Fair value measurements    
Future cash outflows discount rate (as a percent) | item 3.90 5.15
Level 3 | Senior Unsecured Notes maturing 2026 and after | Discount Rate    
Fair value measurements    
Future cash outflows discount rate (as a percent) | item 4.10 5.40
Level 3 | Mortgage Loans Receivable | Discount Rate    
Fair value measurements    
Future cash inflows discount rate (as a percent) | item 9.0 9.0
Carrying Value    
Fair value measurements    
Mortgage loans receivable $ 252,016 $ 242,939
Bank borrowings 146,900 112,000
Senior unsecured notes, net of debt issue costs 528,938 533,029
Fair Value    
Fair value measurements    
Bank borrowings 146,900 112,000
Fair Value | Level 3    
Fair value measurements    
Mortgage loans receivable 309,153 295,492
Senior unsecured notes, net of debt issue costs $ 538,498 $ 508,613