Interest and Debt Expense (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Interest and Debt Expense [Abstract]
Interest expense	$ 89,675	$ 79,648	$ 263,037	$ 247,172
Amortization of deferred financing costs	7,977	7,906	24,523	24,372
Capitalized interest and debt expense	(12,584)	(7,833)	(34,979)	(21,510)
Interest and debt expense, Total	$ 85,068	$ 79,721	$ 252,581	$ 250,034