Fair Value Measurements (Details) $ in Thousands	Jun. 30, 2021 USD ($) item	Dec. 31, 2020 USD ($) item
Fair value measurements
Mortgage loans receivable, net of loan loss reserve	$ 257,051	$ 257,251
Mortgage loans receivable, net of loan loss reserve	13,730	14,465
Senior unsecured notes, net of debt issue costs	$ 552,559	$ 559,482
Level 3 \| Senior Unsecured Notes maturing before 2026 \| Discount Rate
Fair value measurements
Future cash outflows discount rate (as a percent) \| item	0.0300	0.0325
Level 3 \| Senior Unsecured Notes maturing 2026 and after \| Discount Rate
Fair value measurements
Future cash outflows discount rate (as a percent) \| item	0.0325	0.0350
Level 3 \| Mortgage Loans Receivable \| Discount Rate
Fair value measurements
Future cash inflows discount rate (as a percent) \| item	0.100	0.100
Level 3 \| Notes Receivable \| Discount Rate
Fair value measurements
Future cash inflows discount rate (as a percent) \| item	0.060	0.066
Carrying Value
Fair value measurements
Mortgage loans receivable, net of loan loss reserve	$ 257,051	$ 257,251
Mortgage loans receivable, net of loan loss reserve	13,730	14,465
Bank borrowings	65,900	89,900
Senior unsecured notes, net of debt issue costs	552,559	559,482
Fair Value
Fair value measurements
Mortgage loans receivable, net of loan loss reserve	13,403	13,893
Bank borrowings	65,900	89,900
Fair Value \| Level 3
Fair value measurements
Mortgage loans receivable, net of loan loss reserve	301,881	299,751
Senior unsecured notes, net of debt issue costs	$ 578,715	$ 560,140

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

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No definition available.

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Fair value of the amount outstanding under the credit facility.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Value of input used to measure long-term debt.

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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.

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Amount, after allowance for credit loss, of financing receivable. Excludes financing receivable covered under loss sharing agreement.

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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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