Accounts Payable and Accrued Expenses (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Payables and Accruals [Abstract]
Accrued capital expenditures	$ 85,242	$ 71,769
Accounts payable and accrued expenses	34,585	32,509
Interest rate swap agreements liability	5,243	436
Accrued interest payable	4,990	5,687
Due to affiliated companies	616	448
Total accounts payable and accrued expenses	$ 130,676	$ 110,849