Accounts Payable and Accrued Expenses (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Payables and Accruals [Abstract]
Accrued capital expenditures	$ 74,887	$ 85,242
Accounts payable and accrued expenses	28,331	34,585
Interest rate swap agreements liability	22,895	5,243
Accrued interest payable	5,009	4,990
Due to affiliated companies	720	616
Total accounts payable and accrued expenses	$ 131,842	$ 130,676