Fair Value Measurements (Details) $ in Thousands	Mar. 31, 2023 USD ($) item	Dec. 31, 2022 USD ($) item
Fair value measurements
Mortgage loans receivable, net of credit loss reserve	$ 452,955	$ 389,728
Notes receivable, net of credit loss reserve	46,467	58,383
Outstanding Balance	901,045	767,854
Senior unsecured notes, net of debt issue costs	$ 531,400	$ 538,343
Level 3 | Senior Unsecured Notes maturing before 2030 | Discount Rate
Fair value measurements
Future cash outflows discount rate (as a percent) | item	0.0625	0.0650
Level 3 | Senior Unsecured Notes maturing 2030 and after | Discount Rate
Fair value measurements
Future cash outflows discount rate (as a percent) | item	0.0675	0.0700
Level 3 | Financing Receivable | Discount Rate
Fair value measurements
Future cash inflows discount rate (as a percent)	0.076	0.076
Level 3 | Mortgage Loans Receivable | Discount Rate
Fair value measurements
Future cash inflows discount rate (as a percent)	0.091	0.093
Level 3 | Notes Receivable | Discount Rate
Fair value measurements
Future cash inflows discount rate (as a percent) | item	0.064	0.071
Carrying Value
Fair value measurements
Mortgage loans receivable, net of credit loss reserve	$ 452,955	$ 389,728
Revolving line of credit	270,100	130,000
Outstanding Balance	99,545	99,511
Senior unsecured notes, net of debt issue costs	531,400	538,343
Carrying Value | Financing Receivable
Fair value measurements
Notes receivable, net of credit loss reserve	196,096	75,999
Carrying Value | Notes Receivable
Fair value measurements
Notes receivable, net of credit loss reserve	46,467	58,383
Fair Value
Fair value measurements
Revolving line of credit	270,100	130,000
Outstanding Balance	100,000	100,000
Fair Value | Financing Receivable
Fair value measurements
Notes receivable, net of credit loss reserve	198,741	76,033
Fair Value | Level 3
Fair value measurements
Mortgage loans receivable, net of credit loss reserve	532,861	461,276
Senior unsecured notes, net of debt issue costs	477,454	477,653
Fair Value | Level 3 | Notes Receivable
Fair value measurements
Notes receivable, net of credit loss reserve	$ 50,442	$ 61,858