Accounts Payable and Accrued Expenses (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Payables and Accruals [Abstract]
Accrued capital expenditures	$ 53,956	$ 58,057
Accounts payable and accrued expenses	32,101	32,309
Interest rate swap agreement liability	4,887	8,849
Accrued interest payable	3,397	3,219
Due (from) to affiliated companies	(125)	769
Total accounts payable and accrued expenses	$ 94,216	$ 103,203