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Goodwill and Other Intangible Assets, Net (Tables)
 6 Months Ended
Jun. 30, 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 
Acquisitions37,123 
Measurement period adjustments7 
Balance, June 30, 2021$597,462 
Schedule of components of other intangible assets
Other intangible assets consisted of the following (in thousands, except weighted-average life):
 June 30, 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 names8,804 (5,047)3,757 3.5
Non-contractual customers30,131 (11,539)18,592 9.7
License agreements4,981 (4,752)229 0.3
Non-compete agreements6,557 (3,410)3,147 3.9
Contractual customers13,852 (2,191)11,661 6.0
Other4,552 (1,483)3,069 5.7
 Total$85,617 $(28,422)$57,195 7.3

 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 June 30, 2021 was as follows (in thousands):
2021$3,915 
20226,741 
20236,382 
20245,828 
20254,787 
Thereafter12,802 
Total$40,455