Interest and Debt Expense (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Interest Expense Debt [Abstract]
Interest expense	$ 493,067	$ 507,387	$ 523,905
Amortization of deferred financing costs	24,095	19,985	16,329
Capitalized interest	(16,801)	(1,197)	(864)
Interest and Debt Expense, Total	$ 500,361	$ 526,175	$ 539,370