CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Revenue:
Rental and other income	$ 1,451,419	$ 990,370	$ 890,431
Management, development and other fees	11,502	10,257	9,656
Total revenue	1,462,921	1,000,627	900,087
Expenses:
Operating expenses, excluding property taxes	352,245	259,350	246,872
Property taxes	158,774	97,555	88,964
Interest expense, net	172,402	136,920	167,814
Loss on interest rate contract	51,000
Loss on extinguishment of debt, net	14,921	1,179	1,940
Depreciation expense	560,215	243,680	226,728
General and administrative expense	39,573	34,101	29,371
Expensed acquisition, development and other pursuit costs	45,050	11,350	2,967
Casualty and impairment loss		1,449	14,052
Total expenses	1,394,180	785,584	778,708
Equity in (loss) income of unconsolidated entities	(11,154)	20,914	5,120
Gain on sale of land	240	280	13,716
Gain on acquisition of unconsolidated entity		14,194
Income from continuing operations	57,827	250,431	140,215
Discontinued operations:
Income from discontinued operations	16,713	26,820	20,065
Gain on sale of real estate assets	278,231	146,311	281,090
Total discontinued operations	294,944	173,131	301,155
Net income	352,771	423,562	441,370
Net loss attributable to noncontrolling interests	370	307	252
Net income attributable to common stockholders	353,141	423,869	441,622
Other comprehensive income:
Unrealized loss on cash flow hedges		(22,876)	(85,845)
Cash flow hedge losses reclassified to earnings	59,376	1,889
Comprehensive income	$ 412,517	$ 402,882	$ 355,777
Earnings per common share - basic:
Income from continuing operations attributable to common stockholders (in dollars per share)	$ 0.46	$ 2.57	$ 1.55
Discontinued operations attributable to common stockholders (in dollars per share)	$ 2.32	$ 1.77	$ 3.34
Net income attributable to common stockholders (in dollars per share)	$ 2.78	$ 4.34	$ 4.89
Earnings per common share - diluted:
Income from continuing operations attributable to common stockholders (in dollars per share)	$ 0.46	$ 2.55	$ 1.55
Discontinued operations attributable to common stockholders (in dollars per share)	$ 2.32	$ 1.77	$ 3.32
Net income attributable to common stockholders (in dollars per share)	$ 2.78	$ 4.32	$ 4.87