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Goodwill and Other Intangible Assets, Net (Tables)
3 Months Ended
Mar. 31, 2021
Goodwill and Intangible Assets Disclosure [Abstract]  
Summary of changes in carrying amount of goodwill
The changes in the carrying amount of goodwill were as follows (in thousands):
Balance, January 1, 2020$557,914 
Acquisitions6,294 
Measurement period adjustments(3,876)
Balance, December 31, 2020560,332 
Acquisitions33,014 
Measurement period adjustments(52)
Balance, March 31, 2021$593,294 
Schedule of components of other intangible assets
Other intangible assets consisted of the following (in thousands, except weighted-average life):
 March 31, 2021
 Gross
Amount
Accumulated
Amortization
Net
Carrying
Amount
Weighted-
Average
Remaining
Life (Years)
Indefinite life:    
Trademark and trade names$11,350 $— $11,350 N/A
License agreements (GSE)5,390 — 5,390 N/A
Definite life:
Trademark and trade names8,774 (4,687)4,087 3.1
Non-contractual customers30,131 (10,634)19,497 9.7
License agreements4,981 (4,510)471 0.5
Non-compete agreements6,557 (3,165)3,392 4.1
Contractual customers15,022 (1,686)13,336 6.4
Other5,302 (1,317)3,985 5.4
 Total$87,507 $(25,999)$61,508 7.2

 December 31, 2020
 Gross
Amount
Accumulated
Amortization
Net
Carrying
Amount
Weighted-
Average
Remaining
Life (Years)
Indefinite life:    
Trademark and trade names$11,350 $— $11,350 N/A
License agreements (GSE)5,390 — 5,390 N/A
Definite life:
Trademark and trade names5,704 (4,519)1,185 0.1
Non-contractual customers30,131 (9,729)20,402 7.2
License agreements4,981 (4,266)715 0.0
Non-compete agreements6,557 (2,920)3,637 0.6
Contractual customers3,052 (1,584)1,468 0.4
Other350 (208)142 0.0
 Total$67,515 $(23,226)$44,289 5.5
Summary of estimated future amortization expense of definite life intangible assets The estimated future amortization of definite life intangible assets as of March 31, 2021 was as follows (in thousands):
2021$6,358 
20226,769 
20236,409 
20245,855 
20254,820 
Thereafter14,557 
Total$44,768