National Storage Affiliates Trust Annual report pursuant to Section 13 and 15(d)

SELF STORAGE PROPERTY ACQUISITIONS AND DISPOSITIONS - Acquisitions (Details) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019 USD ($) property	Sep. 30, 2019 USD ($) property	Jun. 30, 2019 USD ($) property	Mar. 31, 2019 USD ($) property	Dec. 31, 2018 USD ($) property	Sep. 30, 2018 USD ($) property	Jun. 30, 2018 USD ($) property	Mar. 31, 2018 USD ($) property	Dec. 31, 2019 USD ($) property	Dec. 31, 2018 USD ($) property
Asset Acquisitions During Period
Number of Properties \| property	7	6	24	32	7	13	12	25	69	57
Cash and Acquisition Costs	$ 30,004	$ 34,624	$ 168,442	$ 160,531	$ 49,221	$ 102,012	$ 62,470	$ 105,135	$ 393,601	$ 318,838
Value of OP Equity	2,005	950	15,515	33,356	2,000	3,660	0	22,403	51,826	28,063
Liabilities Assumed, Mortgages	0	0	0	0	0	0	0	7,581	0	7,581
Liabilities Assumed, Other	154	197	1,378	674	174	856	467	670	2,403	2,167
Total	$ 32,163	$ 35,771	$ 185,335	$ 194,561	$ 51,395	$ 106,528	$ 62,937	$ 135,789	$ 447,830	356,649
Fair value debt adjustment on assumed mortgages										$ 200