CONSOLIDATED STATEMENTS OF INCOME - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Revenues
Rental income	$ 1,609,876	$ 1,513,807	$ 1,593,598
Income from loans and investments	89,201	124,218	117,608
Interest and other income	10,984	24,892	6,034
Total revenues	3,872,750	3,745,810	3,574,149
Expenses
Interest	451,662	442,497	448,196
Depreciation and amortization	1,045,620	919,639	887,948
Property-level operating expenses:
Property-level operating expenses	1,808,208	1,689,880	1,483,072
Office building services costs	2,319	1,418	3,391
General, administrative and professional fees	165,996	151,982	135,490
Loss on extinguishment of debt, net	41,900	58,254	754
Merger-related expenses and deal costs	15,235	30,547	10,535
Other	(17,609)	66,768	20,052
Total expenses	3,513,331	3,360,985	2,989,438
Income before unconsolidated entities, real estate dispositions, income taxes, discontinued operations and noncontrolling interests	359,419	384,825	584,711
Loss from unconsolidated entities	(2,454)	(55,034)	(561)
Gain on real estate dispositions	26,022	46,247	717,273
Income tax benefit	56,310	39,953	59,799
Income from continuing operations	439,297	415,991	1,361,222
Discontinued operations	0	(10)	(110)
Net income	439,297	415,981	1,361,112
Net income attributable to noncontrolling interests	6,281	6,514	4,642
Net income attributable to common stockholders	$ 433,016	$ 409,467	$ 1,356,470
Basic:
Income from continuing operations (USD per share)	$ 1.20	$ 1.17	$ 3.83
Net income attributable to common stockholders (USD per share)	1.18	1.15	3.82
Diluted:
Income from continuing operations (USD per share)	1.19	1.16	3.80
Net income attributable to common stockholders (USD per share)	$ 1.17	$ 1.14	$ 3.78
Triple Net Leased Properties
Revenues
Rental income	$ 780,898	$ 737,796	$ 840,131
Property-level operating expenses:
Property-level operating expenses	26,561	0	0
Office Operations
Revenues
Rental income	828,978	776,011	753,467
Property-level operating expenses:
Property-level operating expenses	260,249	243,679	233,007
Resident Fees and Services
Revenues
Revenue from contracts with customers	2,151,533	2,069,477	1,843,232
Office Building and Other Services Revenue
Revenues
Revenue from contracts with customers	11,156	13,416	13,677
Senior Living Operations
Property-level operating expenses:
Property-level operating expenses	$ 1,521,398	$ 1,446,201	$ 1,250,065