Condensed Consolidated Statements of Operations (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Revenues:
Property rental	$ 132,001	$ 102,923
Tenant reinsurance	13,463	10,221
Management fees	6,716	6,178
Total revenues	152,180	119,322
Expenses:
Property operations	43,482	34,437
Tenant reinsurance	2,567	1,910
Acquisition related costs	2,056	452
General and administrative	15,302	12,769
Depreciation and amortization	28,375	23,025
Total expenses	91,782	72,593
Income from operations	60,398	46,729
Interest expense	(19,598)	(17,366)
Non-cash interest expense related to amortization of discount on equity component of exchangeable senior notes	(662)
Interest income	269	184
Interest income on note receivable from Preferred Operating Partnership unit holder	1,213	1,213
Income before equity in earnings of unconsolidated real estate ventures and income tax expense	41,620	30,760
Equity in earnings of unconsolidated real estate ventures	2,419	2,623
Equity in earnings of unconsolidated real estate ventures - purchase of joint venture partners' interests		2,556
Income tax expense	(2,830)	(2,008)
Net income	41,209	33,931
Net income allocated to Preferred Operating Partnership noncontrolling interests	(2,492)	(1,717)
Net income allocated to Operating Partnership and other noncontrolling interests	(1,377)	(789)
Net income attributable to common stockholders	$ 37,340	$ 31,425
Earnings per common share
Basic (in dollars per share)	$ 0.32	$ 0.28
Diluted (in dollars per share)	$ 0.32	$ 0.28
Weighted average number of shares
Basic (in shares)	115,438,325	110,314,668
Diluted (in shares)	121,062,845	114,967,087
Cash dividends paid per common share (in dollars per share)	$ 0.40	$ 0.25