CONDENSED CONSOLIDATED STATEMENTS OF EQUITY - USD ($) $ in Thousands	Total	Series F Preferred Stock	Total  Stockholders’ Equity of NNN	Total  Stockholders’ Equity of NNN Series F Preferred Stock	Preferred Stock Series F Preferred Stock	Common Stock	Capital in Excess of Par Value	Accumulated Deficit	Accumulated Deficit Series F Preferred Stock	Accumulated Other Comprehensive Income (Loss)	Noncontrolling Interests
Balances at Dec. 31, 2019	$ 4,331,682		$ 4,331,675		$ 345,000	$ 1,718	$ 4,495,314	$ (499,229)		$ (11,128)	$ 7
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings	65,176		65,178					65,178			(2)
Dividends declared and paid:
Preferred stock dividends declared and paid		$ (4,485)		$ (4,485)					$ (4,485)
Common stock dividends declared and paid	(87,528)		(87,528)				620	(88,148)
Issuance of common stock:
Director compensation	298		298				298
Stock purchase plan	76		76				76
Restricted shares, net of forfeitures	0		0			3	(3)
Amortization of deferred compensation	2,950		2,950				2,950
Amortization of interest rate hedges	383		383							383
Fair value of forward starting swaps	(7,617)		(7,617)							(7,617)
Balances at Mar. 31, 2020	4,300,935		4,300,930		345,000	1,721	4,499,255	(526,684)		(18,362)	5
Balances at Dec. 31, 2020	4,319,304		4,319,300		345,000	1,753	4,633,771	(644,779)		(16,445)	4
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings	56,587		56,587					56,587
Dividends declared and paid:
Preferred stock dividends declared and paid		$ (4,485)		$ (4,485)					$ (4,485)
Common stock dividends declared and paid	(90,270)		(90,270)				578	(90,848)
Issuance of common stock:
Director compensation	267		267				267
Stock purchase plan	70		70				70
ATM equity program	1,234		1,234			1	1,233
Restricted shares, net of forfeitures	0		0			3	(3)
Stock issuance costs	(156)		(156)				(156)
Amortization of deferred compensation	3,920		3,920				3,920
Amortization of interest rate hedges	1,368		1,368							1,368
Fair value of forward starting swaps	0
Balances at Mar. 31, 2021	$ 4,287,839		$ 4,287,835		$ 345,000	$ 1,757	$ 4,639,680	$ (683,525)		$ (15,077)	$ 4