Segment Reporting (Schedule of Segment Reporting Information, by Segment) (Details) - USD ($)	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Revenues:
Rental income	$ 73,150,000	$ 68,866,000
Resident fees and services	37,060,000	13,939,000
Interest and other income	4,920,000	6,491,000
Total revenues	115,130,000	89,296,000
Utilities	2,471,000	1,097,000
Dietary	2,233,000	1,045,000
Labor	14,699,000	4,299,000
Taxes and insurance	5,701,000	4,425,000
Management fees	1,946,000	691,000
Other senior housing operating expenses	3,923,000	2,183,000
NOI	84,157,000	75,556,000
Depreciation and amortization	23,691,000	19,157,000
Interest expense	15,040,000	14,337,000
Legal expense	305,000	1,426,000
Franchise, excise and other taxes	215,000	269,000
General and administrative expenses	7,851,000	6,829,000
Proxy contest and related expenses	0	264,000
Loan and realty gains, net	(50,000)	(14,000)
Gains on dispositions of real estate properties, net	(2,612,000)	(114,000)
Gains from equity method investment	0	(415,000)
Other non-operating income	(35,000)	0
Net income	39,752,000	33,817,000
Capital expenditures	109,425,000	85,172,000
Operating Segments \| Real Estate Investments
Revenues:
Rental income	73,150,000	68,866,000
Resident fees and services	0	0
Interest and other income	4,920,000	6,491,000
Total revenues	78,070,000	75,357,000
Utilities	0	0
Dietary	0	0
Labor	0	0
Taxes and insurance	2,804,000	2,887,000
Management fees	0	0
Other senior housing operating expenses	0	0
NOI	75,266,000	72,470,000
Depreciation and amortization	16,562,000	16,388,000
Interest expense	0	749,000
Legal expense	0	0
Franchise, excise and other taxes	0	0
General and administrative expenses	0	0
Proxy contest and related expenses		0
Loan and realty gains, net	(50,000)	(14,000)
Gains on dispositions of real estate properties, net	(2,612,000)	(114,000)
Gains from equity method investment		(415,000)
Other non-operating income	(35,000)
Net income	61,401,000	55,876,000
Capital expenditures	1,118,000	83,730,000
Operating Segments \| SHOP
Revenues:
Rental income	0	0
Resident fees and services	37,060,000	13,939,000
Interest and other income	0	0
Total revenues	37,060,000	13,939,000
Utilities	2,471,000	1,097,000
Dietary	2,233,000	1,045,000
Labor	14,699,000	4,299,000
Taxes and insurance	2,897,000	1,538,000
Management fees	1,946,000	691,000
Other senior housing operating expenses	3,923,000	2,183,000
NOI	8,891,000	3,086,000
Depreciation and amortization	7,114,000	2,758,000
Interest expense	0	0
Legal expense	0	0
Franchise, excise and other taxes	0	0
General and administrative expenses	0	0
Proxy contest and related expenses		0
Loan and realty gains, net	0	0
Gains on dispositions of real estate properties, net	0	0
Gains from equity method investment		0
Other non-operating income	0
Net income	1,777,000	328,000
Capital expenditures	108,293,000	1,442,000
Non-Segment /Corporate
Revenues:
Rental income	0	0
Resident fees and services	0	0
Interest and other income	0	0
Total revenues	0	0
Utilities	0	0
Dietary	0	0
Labor	0	0
Taxes and insurance	0	0
Management fees	0	0
Other senior housing operating expenses	0	0
NOI	0	0
Depreciation and amortization	15,000	11,000
Interest expense	15,040,000	13,588,000
Legal expense	305,000	1,426,000
Franchise, excise and other taxes	215,000	269,000
General and administrative expenses	7,851,000	6,829,000
Proxy contest and related expenses		264,000
Loan and realty gains, net	0	0
Gains on dispositions of real estate properties, net	0	0
Gains from equity method investment		0
Other non-operating income	0
Net income	(23,426,000)	(22,387,000)
Capital expenditures	$ 14,000	$ 0

NATIONAL HEALTH INVESTORS INC 10-Q