Interest and Debt Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Interest and Debt Expense [Abstract]
Interest expense	$ 402,057	$ 405,169	$ 430,278
Amortization of deferred financing costs	34,714	32,161	45,263
Capitalized interest and debt expenses	(34,097)	(59,305)	(62,786)
Interest and Debt Expense, Total	$ 402,674	$ 378,025	$ 412,755