Fair Value Measurements (Details) $ in Thousands	Dec. 31, 2020 USD ($) item	Dec. 31, 2019 USD ($) item
Fair value measurements
Mortgage loans receivable	$ 257,251	$ 254,099
Senior unsecured notes, net of debt issue costs	$ 559,482	$ 599,488
Level 3 \| Senior Unsecured Notes maturing before 2026 \| Discount Rate \| Discounted Cash Flow Analysis
Fair value measurements
Future cash outflows discount rate (as a percent) \| item	3.25	3.70
Level 3 \| Senior Unsecured Notes maturing 2026 and after \| Discount Rate \| Discounted Cash Flow Analysis
Fair value measurements
Future cash outflows discount rate (as a percent) \| item	3.50	3.90
Level 3 \| Mortgage Loans Receivable \| Discount Rate \| Discounted Cash Flow Analysis
Fair value measurements
Future cash inflows discount rate (as a percent)	10.0	9.0
Carrying Value
Fair value measurements
Mortgage loans receivable	$ 257,251	$ 254,099
Bank borrowings	89,900	93,900
Senior unsecured notes, net of debt issue costs	559,482	599,488
Fair Value
Fair value measurements
Bank borrowings	89,900	93,900
Fair Value \| Level 3
Fair value measurements
Mortgage loans receivable	299,751	312,824
Senior unsecured notes, net of debt issue costs	$ 560,140	$ 612,375

Value of input used to measure debt instrument, including, but not limited to, convertible and non-convertible debt.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
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+ References

No definition available.

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- Definition

Fair value of the amount outstanding under the credit facility.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=121572278&loc=d3e13433-108611

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Value of input used to measure long-term debt.

+ References

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The balance represents the amount of loans that are secured by real estate mortgages, offset by the reserve to cover probable credit losses on the loan portfolio.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
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Including the current and noncurrent portions, carrying value as of the balance sheet date of uncollateralized debt obligations (with maturities initially due after one year or beyond the operating cycle if longer).

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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