Interest and Debt Expense (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Interest and Debt Expense [Abstract]
Interest expense	$ 98,841	$ 89,675	$ 290,006	$ 263,037
Amortization of deferred financing costs	8,348	7,977	24,486	24,523
Capitalized interest and debt expense	(18,238)	(12,584)	(49,718)	(34,979)
Interest and debt expense, Total	$ 88,951	$ 85,068	$ 264,774	$ 252,581