Interest and Debt Expense (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Interest and Debt Expense [Abstract]
Interest expense	$ 96,574	$ 100,295
Amortization of deferred financing costs	8,981	9,265
Capitalized interest and debt expense	(11,270)	(9,071)
Interest and Debt Expense, Total	$ 94,285	$ 100,489