Interest and Debt Expense (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Interest Expense Debt [Abstract]
Interest expense	$ 126,161	$ 118,747	$ 250,887	$ 243,394
Amortization of deferred financing costs	4,833	5,918	10,255	11,346
Capitalized interest	(9,232)	(345)	(17,492)	(361)
Interest and Debt Expense, Total	$ 121,762	$ 124,320	$ 243,650	$ 254,379