Fair Value Measurements (Details) $ in Thousands	Dec. 31, 2021 USD ($) item	Dec. 31, 2020 USD ($) item
Fair value measurements
Mortgage loans receivable, net of loan loss reserve	$ 344,442	$ 257,251
Notes receivable, net of loan loss reserve	28,337	14,465
Term loans, net of debt issue cost	722,719	649,382
Senior unsecured notes, net of debt issue costs	$ 512,456	$ 559,482
Level 3 | Senior Unsecured Notes maturing before 2030 | Discount Rate
Fair value measurements
Future cash outflows discount rate (as a percent) | item	3.00
Level 3 | Senior Unsecured Notes maturing 2030 and after | Discount Rate
Fair value measurements
Future cash outflows discount rate (as a percent) | item	3.25
Level 3 | Senior Unsecured Notes maturing before 2026 | Discount Rate
Fair value measurements
Future cash outflows discount rate (as a percent) | item		3.25
Level 3 | Senior Unsecured Notes maturing 2026 and after | Discount Rate
Fair value measurements
Future cash outflows discount rate (as a percent) | item		3.50
Level 3 | Mortgage Loans Receivable | Discount Rate
Fair value measurements
Future cash inflows discount rate (as a percent)	9.5	10.0
Level 3 | Notes Receivable | Discount Rate
Fair value measurements
Future cash inflows discount rate (as a percent)	5.6	6.6
Carrying Value
Fair value measurements
Mortgage loans receivable, net of loan loss reserve	$ 344,442	$ 257,251
Notes receivable, net of loan loss reserve	28,337	14,465
Revolving line of credit	110,900	89,900
Term loans, net of debt issue cost	99,363
Senior unsecured notes, net of debt issue costs	512,456	559,482
Fair Value
Fair value measurements
Notes receivable, net of loan loss reserve	28,653	13,893
Revolving line of credit	110,900	89,900
Term loans, net of debt issue cost	100,000
Fair Value | Level 3
Fair value measurements
Mortgage loans receivable, net of loan loss reserve	405,162	299,751
Senior unsecured notes, net of debt issue costs	$ 540,045	$ 560,140