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Goodwill and Other Intangible Assets, Net
 12 Months Ended
Dec. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and Other Intangible Assets, Net GOODWILL AND OTHER INTANGIBLE ASSETS, NET
A summary of changes in the carrying amount of goodwill by operating segment for the years ended December 31, 2020 and 2019 were as follows (in thousands): 
Financial
Services		Benefits and
Insurance
Services		National
Practices		Total
Goodwill
December 31, 2018$329,626 $233,008 $1,666 $564,300 
Additions5,077 19,292 — 24,369 
Divestitures and other adjustment(456)— — (456)
December 31, 2019$334,247 $252,300 $1,666 $588,213 
Additions34,785 62,654 — 97,439 
Divestitures and other adjustment(993)(1,576)— (2,569)
December 31, 2020$368,039 $313,378 $1,666 $683,083 
We review goodwill at the reporting unit level at least annually, as of November 1, for impairment. We had five reporting units at November 1, 2020. No goodwill impairment was recognized as a result of the annual evaluation.
The components of goodwill and other intangible assets, net at December 31, 2020 and 2019 were as follows (in thousands):
 20202019
Goodwill$683,083 $588,213 
Intangibles :
Client lists207,084 188,898 
Other intangibles11,244 9,882 
Total intangibles218,328 198,780 
Total goodwill and other intangibles assets901,411 786,993 
Accumulated amortization:
Client lists(137,284)(125,887)
Other intangibles(7,377)(6,435)
Total accumulated amortization(144,661)(132,322)
Goodwill and other intangible assets, net$756,750 $654,671 
Amortization expense for client lists and other intangible assets was $13.6 million, $14.1 million and $17.5 million in 2020, 2019 and 2018, respectively. The weighted-average useful lives of total intangible assets, client lists and other intangible assets were 6.8 years, 6.5 years and 6.8 years, respectively. Other intangible assets are amortized over periods ranging from 2 to 10 years. Based on the amount of intangible assets subject to amortization at
December 31, 2020, the estimated amortization expense is $14.0 million for 2021, $12.3 million for 2022, $11.1 million for 2023, $9.6 million for 2024 and $8.2 million for 2025.