Interest and Debt Expense (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Interest and Debt Expense [Abstract]
Interest expense	$ 104,435	$ 96,297	$ 204,730	$ 191,625
Amortization of deferred financing costs	8,508	7,497	17,773	14,953
Capitalized interest and debt expense	(7,367)	(11,702)	(16,438)	(22,812)
Interest and Debt Expense, Total	$ 105,576	$ 92,092	$ 206,065	$ 183,766