Segment Reporting (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
Segment Reporting
Net (loss) income	$ (10,885)	$ 86,747	$ 100,681	$ 301,178
Indirect operating expenses, net of corporate income	10,780	7,396	30,673	24,049
Investments and investment management expense	1,043	1,582	3,154	4,526
Expensed acquisition, development and other pursuit costs	2,176	608	46,041	1,749
Interest expense, net	43,945	33,985	127,772	100,804
Loss on interest rate contract	53,484		51,000
Loss on extinguishment of debt, net				1,179
General and administrative expense	9,878	8,372	31,262	26,398
Equity in (income) loss of unconsolidated entities	(3,260)	(5,553)	16,244	(9,801)
Depreciation expense	160,682	62,750	457,837	183,688
Gain on sale of real estate assets			(118,413)	(95,329)
Income from discontinued operations	(3,221)	(4,340)	(7,073)	(15,062)
Gain on acquisition of unconsolidated real estate entity		(14,194)		(14,194)
Net operating income	$ 264,622	$ 177,353	$ 739,178	$ 509,185