Consolidated Statements of Operations - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Revenues:
Property rental	$ 676,138	$ 559,868	$ 446,682
Tenant reinsurance	71,971	59,072	47,317
Management fees and other income	34,161	28,215	26,614
Total revenues	782,270	647,155	520,613
Expenses:
Property operations	203,965	172,416	140,012
Tenant reinsurance	13,033	10,427	9,022
Acquisition related costs	69,401	9,826	8,618
General and administrative	67,758	60,942	54,246
Depreciation and amortization	133,457	115,076	95,232
Total expenses	487,614	368,687	307,130
Income from operations	294,656	278,468	213,483
Gain (loss) on real estate transactions and earnout from prior acquisitions	1,501	(10,285)	960
Property casualty loss, net		(1,724)
Loss on extinguishment of debt related to portfolio acquisition			(9,153)
Interest expense	(95,682)	(81,330)	(71,630)
Non-cash interest expense related to amortization of discount on equity component of exchangeable senior notes	(3,310)	(2,683)	(1,404)
Interest income	3,461	1,607	749
Interest income on note receivable from Preferred Operating Partnership unit holder	4,850	4,850	4,850
Income before equity in earnings of unconsolidated real estate ventures and income tax expense	205,476	188,903	137,855
Equity in earnings of unconsolidated real estate ventures	12,351	10,541	11,653
Equity in earnings of unconsolidated real estate ventures - gain on sale of real estate assets and purchase of joint venture partners' interests	2,857	4,022	46,032
Income tax expense	(11,148)	(7,570)	(9,984)
Net income	209,536	195,896	185,556
Net income allocated to Preferred Operating Partnership noncontrolling interests	(11,718)	(10,991)	(8,006)
Net income allocated to Operating Partnership and other noncontrolling interests	(8,344)	(6,550)	(5,474)
Net income attributable to common stockholders	$ 189,474	$ 178,355	$ 172,076
Earnings per common share
Basic	$ 1.58	$ 1.54	$ 1.54
Diluted	$ 1.56	$ 1.53	$ 1.53
Weighted average number of shares
Basic	119,816,743	115,713,807	111,349,361
Diluted	126,918,869	121,435,267	113,105,094