Interest and Debt Expense (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Interest Expense Debt [Abstract]
Interest expense	$ 125,422	$ 121,230	$ 375,963	$ 364,223
Amortization of deferred financing costs	4,980	5,623	15,189	16,918
Capitalized interest	(10,532)	(7,523)	(28,024)	(7,884)
Interest and Debt Expense, Total	$ 119,870	$ 119,330	$ 363,128	$ 373,257