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Intangible Assets
 9 Months Ended
Sep. 30, 2021
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 nine months ended September 30, 2021:
 Critical Illness Recovery HospitalRehabilitation HospitalOutpatient
Rehabilitation		ConcentraTotal
 (in thousands)
Balance as of December 31, 2020$1,084,761 $432,753 $646,433 $1,215,067 $3,379,014 
Acquisition of businesses— 9,402 3,621 7,757 20,780 
Balance as of September 30, 2021$1,084,761 $442,155 $650,054 $1,222,824 $3,399,794 
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, 2020September 30, 2021
 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 need18,392 — 18,392 18,544 — 18,544 
Accreditations1,874 — 1,874 1,874 — 1,874 
Finite-lived intangible assets:      
Trademarks5,000 (5,000)— 5,000 (5,000)— 
Customer relationships291,923 (113,346)178,577 303,424 (133,859)169,565 
Non-compete agreements33,771 (11,771)22,000 35,959 (14,207)21,752 
Total identifiable intangible assets$517,658 $(130,117)$387,541 $531,499 $(153,066)$378,433 
The Company’s accreditations and trademarks have renewal terms and the costs to renew these intangible assets are expensed as incurred. At September 30, 2021, the accreditations and trademarks have a weighted average time until next renewal of 1.5 years and 8.0 years, respectively.
The Company’s finite-lived intangible assets amortize over their estimated useful lives. Amortization expense was $6.9 million and $7.4 million for the three months ended September 30, 2020 and 2021, respectively. Amortization expense was $20.6 million and $21.8 million for the nine months ended September 30, 2020 and 2021, respectively.