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Intangible Assets
 3 Months Ended
Apr. 01, 2023
Intangible Asset Disclosure Text Block [Abstract]  
Intangible Assets Intangible Assets
The gross carrying amount of intangible assets not subject to amortization and intangible assets subject to amortization
is as follows (in thousands):
    
 April 1, 2023December 31, 2022
Indefinite Lived Intangible Assets:  
Trade names$52,082 $51,639 
 52,082 51,639 
Finite Lived Intangible Assets:  
Routes746,492 781,286 
Permits559,367 557,083 
Non-compete agreements695 695 
Trade names76,834 76,549 
Royalty, consulting, land use rights and leasehold21,051 20,971 
Other283,951 — 
 1,688,390 1,436,584 
Accumulated Amortization:
Routes(208,662)(196,108)
Permits(379,208)(368,005)
Non-compete agreements(594)(563)
Trade names(55,702)(53,486)
Royalty, consulting, land use rights and leasehold(5,169)(4,939)
(649,335)(623,101)
Total Intangible assets, less accumulated amortization$1,091,137 $865,122 

Gross intangible assets changed due to net acquisition activity in the first three months of fiscal 2023 by approximately $245.0 million and the remaining change is due to foreign currency translation and retirements. Other intangibles represent the preliminary amounts recorded in the Gelnex Acquisition. Amortization expense for the three months ended April 1, 2023 and April 2, 2022, was approximately $26.1 million and $16.5 million, respectively.