Interest and Debt Expense (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Interest and Debt Expense [Abstract]
Interest expense	$ 100,486	$ 104,435	$ 197,060	$ 204,730
Amortization of deferred financing costs	8,353	8,508	17,334	17,773
Capitalized interest and debt expense	(12,042)	(7,367)	(23,312)	(16,438)
Interest and debt expense, Total	$ 96,797	$ 105,576	$ 191,082	$ 206,065