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Intangible Assets
 12 Months Ended
Dec. 31, 2023
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, 2022 and 2023:
 Critical Illness Recovery HospitalRehabilitation HospitalOutpatient
Rehabilitation		ConcentraTotal
 (in thousands)
Balance as of January 1, 2022$1,131,440 $442,155 $654,125 $1,221,192 $3,448,912 
Acquisition of businesses6,505 — 10,853 4,679 22,037 
Measurement period adjustment13,251 — — — 13,251 
Balance as of December 31, 20221,151,196 442,155 664,978 1,225,871 3,484,200 
Acquisition of businesses6,606 16,185 2,305 3,874 28,970 
Balance as of December 31, 2023$1,157,802 $458,340 $667,283 $1,229,745 $3,513,170 
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,
 20222023
 Gross
Carrying
Amount		Accumulated
Amortization		Net
Carrying
Amount		Gross
Carrying
Amount		Accumulated
Amortization		Net
Carrying
Amount
 (in thousands)
Indefinite-lived intangible assets:      
Trademarks$166,698 $— $166,698 $166,698 $— $166,698 
Certificates of need22,827 — 22,827 26,183 — 26,183 
Accreditations1,836 — 1,836 1,836 — 1,836 
Finite-lived intangible assets:     
Trademarks5,000 (5,000)— 5,000 (5,000)— 
Customer relationships310,279 (170,265)140,014 317,571 (200,312)117,259 
Non-compete agreements36,729 (16,442)20,287 38,262 (20,322)17,940 
Total identifiable intangible assets$543,369 $(191,707)$351,662 $555,550 $(225,634)$329,916 
The Company’s accreditations and trademarks have renewal terms and the costs to renew these intangible assets are expensed as incurred. At December 31, 2023, the accreditations and trademarks have a weighted average time until next renewal of 1.5 years and 5.7 years, respectively.
The Company’s finite-lived intangible assets amortize over their estimated useful lives. Amortization expense was $29.5 million, $31.0 million, and $31.7 million for the years ended December 31, 2021, 2022, and 2023, respectively.
Estimated amortization expense of the Company’s finite-lived intangible assets for each of the five succeeding years is as follows:
20242025202620272028
(in thousands)
Amortization expense$23,249 $16,535 $15,385 $14,441 $13,337