Consolidated Statements of Operations - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Revenues:
Property rental	$ 1,130,177	$ 1,039,340
Property rental			$ 967,229
Tenant reinsurance	128,387	115,507	98,401
Management fees and other income	49,890	41,757	39,379
Total revenues	1,308,454	1,196,604	1,105,009
Expenses:
Property operations	336,050	291,695	271,974
Tenant reinsurance	29,376	25,707	19,173
General and administrative	89,418	81,256	78,961
Depreciation and amortization	219,857	209,050	193,296
Total expenses	674,701	607,708	563,404
Gain on real estate transactions and impairment of real estate	1,205	30,807	112,789
Income from operations	634,958	619,703	654,394
Interest expense	(186,526)	(178,436)	(153,511)
Non-cash interest expense related to amortization of discount on equity component of exchangeable senior notes	(4,742)	(4,687)	(5,103)
Interest income	7,467	5,292	6,736
Income before equity in earnings of unconsolidated real estate ventures and income tax expense	451,157	441,872	502,516
Equity in earnings of unconsolidated real estate ventures	11,274	14,452	15,331
Income tax expense	(11,308)	(9,244)	(3,625)
Net income	451,123	447,080	514,222
Net income allocated to Preferred Operating Partnership noncontrolling interests	(12,492)	(13,995)	(14,989)
Net income allocated to Operating Partnership and other noncontrolling interests	(18,664)	(17,796)	(20,220)
Net income attributable to common stockholders	$ 419,967	$ 415,289	$ 479,013
Earnings per common share
Basic (in dollars per share)	$ 3.27	$ 3.29	$ 3.79
Diluted (in dollars per share)	$ 3.24	$ 3.27	$ 3.76
Weighted average number of shares
Basic (in shares)	128,203,568	126,087,487	125,967,831
Diluted (in shares)	136,433,769	133,159,033	134,155,771