Organization and Summary of Significant Accounting Policies (Computation of Basic and Diluted Earnings per Share) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Earnings Per Share [Abstract]
Net earnings available to NNNs common stockholders	$ 106,787	$ 88,421	$ 295,658	$ 243,964
Less: Earnings allocated to unvested restricted shares	(171)	(135)	(448)	(471)
Net earnings used in basic and diluted earnings per share	$ 106,616	$ 88,286	$ 295,210	$ 243,493
Basic and Diluted Weighted Average Shares Outstanding:
Weighted average number of shares outstanding	182,424,814	177,881,613	182,092,117	176,510,417
Less: Unvested restricted shares (in shares)	(290,458)	(246,116)	(268,713)	(292,433)
Less: Unvested contingent restricted shares (in shares)	(736,083)	(734,711)	(702,441)	(675,628)
Weighted Average Number of Shares Outstanding, Basic, Total	181,398,273	176,900,786	181,120,963	175,542,356
Other dilutive securities (in shares)	323,194	466,924	339,659	451,551
Weighted average number of shares outstanding used in diluted earnings per share (in shares)	181,721,467	177,367,710	181,460,622	175,993,907