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Intangibles
6 Months Ended
Jun. 30, 2021
Goodwill and Intangible Assets Disclosure [Abstract]  
Intangibles Intangibles
Intangible assets other than goodwill at the respective balance sheet dates consisted of the following:
June 30, 2021
(in thousands)Weighted average remaining life (in years)Gross carrying amountAccumulated amortizationNet book value
Intangible assets subject to amortization:
Trade name - ModSpace0.2$3,000 $(2,875)$125 
Mobile Mini customer relationships
7.1209,000 (25,048)183,952 
Technology 5.01,500 (250)1,250 
Indefinite-lived intangible assets:
Trade name - Mobile Mini164,000 — 164,000 
Trade name - WillScot125,000 — 125,000 
Total intangible assets other than goodwill$502,500 $(28,173)$474,327 
December 31, 2020
(in thousands)Weighted average remaining life (in years)Gross carrying amountAccumulated amortizationNet book value
Intangible assets subject to amortization:
Trade name - ModSpace0.7$3,000 $(2,375)$625 
Mobile Mini customer relationships
8.0217,000 (12,053)204,947 
Technology5.51,500 (125)1,375 
Indefinite-lived intangible assets:
Trade name - Mobile Mini164,000 — 164,000 
Trade name - WillScot125,000 — 125,000 
Total intangible assets other than goodwill$510,500 $(14,553)$495,947 
Amortization expense related to intangible assets was $6.8 million and $0.3 million for the three months ended June 30, 2021 and 2020, respectively, and $13.8 million and $0.5 million for the six months ended June 30, 2021 and 2020, respectively.
As discussed in Note 2, the Company acquired Mobile Mini on July 1, 2020. The Company recorded $164.0 million to indefinite-lived intangible assets and $210.5 million of intangibles subject to amortization related to Mobile Mini customer relationships and technology.
Based on the carrying value at June 30, 2021, future amortization of intangible assets is expected to be as follows for the years ended December 31:
(in thousands)
2021 (remaining) $13,334 
202226,416 
202326,416 
202426,416 
202526,416 
Thereafter66,329 
Total$185,327