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Intangibles

3 Months Ended

Mar. 31, 2022

Intangible assets other than goodwill at the respective balance sheet dates consisted of the following:


	March 31, 2022
(in thousands)	Weighted average remaining life (in years)	Gross carrying amount		Accumulated amortization		Net book value
Intangible assets subject to amortization:

Mobile Mini customer relationships	6.4	$	209,000	$	(45,277)	$	163,723
Technology	4.3	1,500		(438)		1,062
Indefinite-lived intangible assets:
Trade name - Mobile Mini		164,000		—		164,000
Trade name - WillScot		125,000		—		125,000
Total intangible assets other than goodwill		$	499,500	$	(45,715)	$	453,785


	December 31, 2021
(in thousands)	Weighted average remaining life (in years)	Gross carrying amount		Accumulated amortization		Net book value
Intangible assets subject to amortization:

Mobile Mini customer relationships	6.6	$	209,000	$	(38,447)	$	170,553
Technology	4.5	1,500		(375)		1,125
Indefinite-lived intangible assets:
Trade name - Mobile Mini		164,000		—		164,000
Trade name - WillScot		125,000		—		125,000
Total intangible assets other than goodwill		$	499,500	$	(38,822)	$	460,678

Amortization expense related to intangible assets was $6.6 million and $7.0 million for the three months ended March 31, 2022 and 2021, respectively.

Based on the carrying value at March 31, 2022, future amortization of intangible assets is expected to be as follows for the years ended December 31: