CONSOLIDATED STATEMENTS OF INCOME AND COMPREHENSIVE INCOME - USD ($)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Revenues:
Rental income	$ 826,090,000	$ 771,618,000	$ 723,859,000
Interest and other income from real estate transactions	2,021,000	1,435,000	2,548,000
Total revenues	828,111,000	773,053,000	726,407,000
Operating expenses:
General and administrative	43,746,000	41,695,000	44,640,000
Real estate	28,378,000	26,281,000	28,385,000
Depreciation and amortization	238,625,000	223,834,000	205,220,000
Leasing transaction costs	299,000	320,000	203,000
Impairment losses - real estate, net of recoveries	5,990,000	8,309,000	21,957,000
Executive retirement costs	3,454,000	7,520,000	0
Total operating expenses	320,492,000	307,959,000	300,405,000
Gain on disposition of real estate	47,485,000	17,443,000	23,094,000
Earnings from operations	555,104,000	482,537,000	449,096,000
Other expenses (revenues):
Interest and other income	(1,134,000)	(149,000)	(216,000)
Interest expense	163,898,000	148,065,000	137,874,000
Loss on early extinguishment of debt	0	0	21,328,000
Total other expenses (revenues)	162,764,000	147,916,000	158,986,000
Net earnings	392,340,000	334,621,000	290,110,000
Loss (earnings) attributable to noncontrolling interests	0	5,000	3,000
Net earnings attributable to NNN	392,340,000	334,626,000	290,113,000
Excess of redemption value over carrying value of preferred shares redeemed	0	0	(10,897,000)
Net earnings attributable to common stockholders	$ 392,340,000	$ 334,626,000	$ 264,217,000
Net earnings per share of common stock:
Basic (in dollars per share)	$ 2.16	$ 1.89	$ 1.51
Diluted (in dollars per share)	$ 2.16	$ 1.89	$ 1.51
Weighted average number of common shares outstanding:
Basic (in shares)	181,200,040	176,403,656	174,710,921
Diluted (in shares)	181,689,723	177,067,865	174,818,899
Other comprehensive income:
Net earnings attributable to NNN	$ 392,340,000	$ 334,626,000	$ 290,113,000
Amortization of interest rate hedges	2,471,000	2,374,000	3,073,000
Fair value of forward starting swaps	0	0	(1,584,000)
Comprehensive income attributable to NNN	394,811,000	337,000,000	291,602,000
Comprehensive income attributable to non-controlling interests	0	(5,000)	(3,000)
Total comprehensive income	394,811,000	336,995,000	291,599,000
Series F Preferred Stock
Other expenses (revenues):
Preferred stock dividends	$ 0	$ 0	$ (14,999,000)