Consolidated Statements of Operations - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Revenues:
Property rental	$ 1,157,522	$ 1,130,177	$ 1,039,340
Tenant reinsurance	146,561	128,387	115,507
Management fees and other income	52,129	49,890	41,757
Total revenues	1,356,212	1,308,454	1,196,604
Expenses:
Property operations	360,615	336,050	291,695
Tenant reinsurance	26,494	29,376	25,707
General and administrative	96,594	89,418	81,256
Depreciation and amortization	224,444	219,857	209,050
Total expenses	708,147	674,701	607,708
Gain on real estate transactions	18,075	1,205	30,807
Income from operations	666,140	634,958	619,703
Interest expense	(168,626)	(186,526)	(178,436)
Non-cash interest expense related to amortization of discount on equity component of exchangeable senior notes	(3,675)	(4,742)	(4,687)
Interest income	15,192	7,467	5,292
Income before equity in earnings of unconsolidated real estate ventures and income tax expense	509,031	451,157	441,872
Equity in earnings and dividend income from unconsolidated real estate entities	22,361	11,274	14,452
Income tax expense	(13,810)	(11,308)	(9,244)
Net income	517,582	451,123	447,080
Net income allocated to Preferred Operating Partnership noncontrolling interests	(12,882)	(12,492)	(13,995)
Net income allocated to Operating Partnership and other noncontrolling interests	(22,921)	(18,664)	(17,796)
Net income attributable to common stockholders	$ 481,779	$ 419,967	$ 415,289
Earnings per common share
Basic (in dollars per share)	$ 3.71	$ 3.27	$ 3.29
Diluted (in dollars per share)	$ 3.71	$ 3.24	$ 3.27
Weighted average number of shares
Basic (in shares)	129,541,531	128,203,568	126,087,487
Diluted (in shares)	129,584,829	136,433,769	133,159,033