Accounts Payable, Accrued Liabilities, and Other Liabilities (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Payables and Accruals [Abstract]
Refundable entrance fees	$ 311,410	$ 317,444
Construction related accrued liabilities	107,798	95,293
Accrued interest	36,013	78,735
Other accounts payable and accrued liabilities	241,819	271,919
Accounts payable, accrued liabilities, and other liabilities	$ 697,040	$ 763,391