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Intangible Assets
 12 Months Ended
Dec. 31, 2024
Goodwill and Intangible Assets Disclosure [Abstract]  
Intangible Assets Intangible Assets
Goodwill
The following table shows changes in the carrying amounts of goodwill by reporting unit for the years ended December 31, 2024 and 2023:
 CentersOnsitesOther BusinessesTotal
 (in thousands)
Balance as of January 1, 2023$1,137,997 $50,940 $36,934 $1,225,871 
Acquisition of businesses3,874 — — 3,874 
Balance as of December 31, 20231,141,871 50,940 36,934 1,229,745 
Acquisition of businesses4,962 — — 4,962 
Balance as of December 31, 2024$1,146,833 $50,940 $36,934 $1,234,707 
Identifiable Intangible Assets
The following table provides the gross carrying amounts, accumulated amortization, and net carrying amounts for the Company’s identifiable intangible assets:
 December 31,
 20242023
 Gross
Carrying
Amount		Accumulated
Amortization		Net
Carrying
Amount		Gross
Carrying
Amount		Accumulated
Amortization		Net
Carrying
Amount
 (in thousands)
Indefinite-lived intangible assets:      
Trademarks$104,900 $— $104,900 $104,900 $— $104,900 
Finite-lived intangible assets: 
Trademarks5,000 (5,000)— 5,000 (5,000)— 
Customer relationships320,161 (222,522)97,639 317,571 (200,312)117,259 
Non-compete agreements7,749 (5,563)2,186 7,084 (4,474)2,610 
Total identifiable intangible assets$437,810 $(233,085)$204,725 $434,555 $(209,786)$224,769 
The Company’s trademarks have renewal terms and the costs to renew these intangible assets are expensed as incurred. The Company’s finite-lived and indefinite-lived trademarks will be renewed in 2028 and 2029, respectively.
The Company’s finite-lived intangible assets amortize over their estimated useful lives. Amortization expense was $22.2 million, $30.0 million, and $29.2 million for the years ended December 31, 2024, 2023, and 2022, respectively.
Estimated amortization expense of the Company’s finite-lived intangible assets for each of the five succeeding years is as follows:
20252026202720282029
(in thousands)
Amortization expense$15,525 $14,309 $13,247 $12,009 $11,127