Interest and Debt Expense (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Interest Expense Debt [Abstract]
Interest expense	$ 124,726	$ 124,647
Amortization of deferred financing costs	5,422	5,428
Capitalized interest	(8,260)	(16)
Interest and Debt Expense, Total	$ 121,888	$ 130,059