CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Revenue:
Rental and other income	$ 390,113	$ 258,788	$ 1,072,273	$ 742,254
Management, development and other fees	3,014	2,533	8,198	7,852
Total revenue	393,127	261,321	1,080,471	750,106
Expenses:
Operating expenses, excluding property taxes	97,650	67,471	258,605	196,325
Property taxes	42,678	25,475	116,515	73,171
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
Depreciation expense	160,682	62,750	457,837	183,688
General and administrative expense	9,878	8,372	31,262	26,398
Expensed acquisition, development and other pursuit costs	2,176	608	46,041	1,749
Total expenses	410,493	198,661	1,089,032	583,314
Equity in income (loss) of unconsolidated entities	3,260	5,553	(16,244)	9,801
Gain on sale of land			240	280
Gain on acquisition of unconsolidated real estate entity		14,194		14,194
(Loss) income from continuing operations	(14,106)	82,407	(24,565)	191,067
Discontinued operations:
Income from discontinued operations	3,221	4,340	7,073	15,062
Gain on sale of real estate assets			118,173	95,049
Total discontinued operations	3,221	4,340	125,246	110,111
Net (loss) income	(10,885)	86,747	100,681	301,178
Net loss attributable to noncontrolling interests	170	97	248	334
Net (loss) income attributable to common stockholders	(10,715)	86,844	100,929	301,512
Other comprehensive income:
Unrealized loss on cash flow hedges		(6,977)		(23,767)
Cash flow hedge losses reclassified to earnings	54,948		57,913
Comprehensive income	$ 44,233	$ 79,867	$ 158,842	$ 277,745
Earnings per common share - basic:
(Loss) income from continuing operations attributable to common stockholders (in dollars per share)	$ (0.11)	$ 0.85	$ (0.19)	$ 1.99
Discontinued operations attributable to common stockholders (in dollars per share)	$ 0.03	$ 0.04	$ 0.99	$ 1.15
Net (loss) income attributable to common stockholders (in dollars per share)	$ (0.08)	$ 0.89	$ 0.80	$ 3.14
Earnings per common share - diluted:
(Loss) income from continuing operations attributable to common stockholders (in dollars per share)	$ (0.11)	$ 0.85	$ (0.19)	$ 1.99
Discontinued operations attributable to common stockholders (in dollars per share)	$ 0.03	$ 0.04	$ 0.99	$ 1.14
Net (loss) income attributable to common stockholders (in dollars per share)	$ (0.08)	$ 0.89	$ 0.80	$ 3.13
Dividends per common share: (in dollars per share)	$ 1.07	$ 0.97	$ 3.21	$ 2.91