CONSOLIDATED STATEMENTS OF INCOME - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Rental income:
Total rental income	$ 1,494,892	$ 1,609,876	$ 1,513,807
Interest and Dividend Income, Operating	80,505	89,201	124,218
Interest and other income	7,609	10,984	24,892
Total revenues	3,795,357	3,872,750	3,745,810
Expenses
Interest	469,541	451,662	442,497
Depreciation and amortization	1,109,763	1,045,620	919,639
Property-level operating expenses:
Property-level operating expenses	1,937,443	1,808,208	1,689,880
Office building services costs	2,315	2,319	1,418
General, administrative and professional fees	130,158	158,726	145,978
Gain (Loss) on Extinguishment of Debt	10,791	41,900	58,254
Merger-related expenses and deal costs	29,812	15,235	30,547
Allowance on loans receivable and investments	24,238	0	0
Other	707	(10,339)	72,772
Total expenses	3,714,768	3,513,331	3,360,985
Income before unconsolidated entities, real estate dispositions, income taxes, discontinued operations and noncontrolling interests	80,589	359,419	384,825
Income (loss) from unconsolidated entities	1,844	(2,454)	(55,034)
Gain on real estate dispositions	262,218	26,022	46,247
Income tax benefit	96,534	56,310	39,953
Income from continuing operations	441,185	439,297	415,991
Discontinued operations	0	0	(10)
Net income	441,185	439,297	415,981
Net income attributable to noncontrolling interests	2,036	6,281	6,514
Net income attributable to common stockholders	$ 439,149	$ 433,016	$ 409,467
Basic:
Income from continuing operations (USD per share)	$ 1.18	$ 1.20	$ 1.17
Net income attributable to common stockholders (USD per share)	1.18	1.18	1.15
Diluted:
Income from continuing operations (USD per share)	1.17	1.19	1.16
Net income attributable to common stockholders (USD per share)	$ 1.17	$ 1.17	$ 1.14
Triple-net leased properties
Rental income:
Total rental income	$ 695,265	$ 780,898	$ 737,796
Property-level operating expenses:
Property-level operating expenses	22,160		0
Office operations
Rental income:
Total rental income	799,627	828,978	776,011
Property-level operating expenses:
Property-level operating expenses	256,612	260,249	243,679
Resident Fees and Services
Rental income:
Revenue from contracts with customers	2,197,160	2,151,533	2,069,477
Office Building and Other Services Revenue
Rental income:
Revenue from contracts with customers	15,191	11,156	13,416
Senior living operations
Property-level operating expenses:
Property-level operating expenses	$ 1,658,671	$ 1,521,398	$ 1,446,201