Interest and Debt Expense (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Interest And Debt Expense [Abstract]
Interest expense	$ 125,484	$ 125,136	$ 243,736	$ 248,363
Amortization of deferred financing costs	8,127	4,753	12,939	10,132
Capitalized interest	(16,560)	(9,232)	(30,182)	(17,492)
Interest and Debt Expense, Total	$ 117,051	$ 120,657	$ 226,493	$ 241,003