Accounts Payable, Accrued Liabilities, and Other Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Payables and Accruals [Abstract]
Accrued interest	$ 78,735	$ 69,960
Construction related accrued liabilities	95,293	117,048
Refundable entrance fees	317,444	0
Other accounts payable and accrued liabilities	271,919	270,524
Accounts payable, accrued liabilities, and other liabilities	$ 763,391	$ 457,532