Gladstone Commercial Corporation Quarterly report pursuant to Section 13 or 15(d)

Real Estate and Intangible Assets - Carrying Value of Intangible Assets and Accumulated Amortization (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Finite-Lived Intangible Assets [Line Items]
Below market leases and deferred revenue, lease intangibles	$ (60,927)	$ (66,138)
Below market leases and deferred revenue, accumulated amortization	29,113	26,141
Lease Intangibles
Finite-Lived Intangible Assets [Line Items]
Lease Intangibles	245,593	259,018
Accumulated Amortization	(142,964)	(147,396)
In-place leases
Finite-Lived Intangible Assets [Line Items]
Lease Intangibles	98,904	104,394
Accumulated Amortization	(62,270)	(63,240)
Leasing costs
Finite-Lived Intangible Assets [Line Items]
Lease Intangibles	83,075	85,038
Accumulated Amortization	(45,170)	(45,501)
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Lease Intangibles	63,614	69,586
Accumulated Amortization	(35,524)	(38,655)
Above market leases
Finite-Lived Intangible Assets [Line Items]
Lease Intangibles	13,431	15,371
Accumulated Amortization	$ (10,546)	$ (11,909)