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Goodwill and Other Intangible Assets, Net | 12 Months Ended
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Dec. 31, 2018
Goodwill And Intangible Assets Disclosure [Abstract] |
Goodwill and Other Intangible Assets, Net | Note 5. 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, 2018 and 2017 were as follows (in thousands):
|  | Financial Services |  |  | Benefits and Insurance Services |  |  | National Practices |  |  | Total Goodwill |
December 31, 2016 |  | $ | 271,330 |  |  | $ | 214,488 |  |  | $ | 1,666 |  |  | $ | 487,484 |
Additions |  |  | 35,531 |  |  |  | 5,409 |  |  |  | — |  |  |  | 40,940 |
December 31, 2017 |  | $ | 306,861 |  |  | $ | 219,897 |  |  | $ | 1,666 |  |  | $ | 528,424 |
Additions |  |  | 22,978 |  |  |  | 13,111 |  |  |  | — |  |  |  | 36,089 |
Divestitures |  |  | (213 | ) |  |  | — |  |  |  | — |  |  |  | (213 | )
December 31, 2018 |  | $ | 329,626 |  |  | $ | 233,008 |  |  | $ | 1,666 |  |  | $ | 564,300 |
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, 2018. No goodwill impairment was recognized as a result of the annual evaluation. The components of goodwill and other intangible assets, net at December 31, 2018 and 2017 were as follows (in thousands):
|  | 2018 |  |  | 2017 |
Goodwill |  | $ | 564,300 |  |  | $ | 528,424 |
Intangibles : |  |  |  |  |  |  |  |
Client lists |  |  | 181,564 |  |  |  | 177,221 |
Other intangibles |  |  | 9,447 |  |  |  | 8,767 |
Total intangibles |  |  | 191,011 |  |  |  | 185,988 |
Total goodwill and other intangibles assets |  |  | 755,311 |  |  |  | 714,412 |
Accumulated amortization: |  |  |  |  |  |  |  |
Client lists |  |  | (112,905 | ) |  |  | (97,063 | )
Other intangibles |  |  | (5,397 | ) |  |  | (4,143 | )
Total accumulated amortization |  |  | (118,302 | ) |  |  | (101,206 | )
Goodwill and other intangible assets, net |  | $ | 637,009 |  |  | $ | 613,206 |
Amortization expense for client lists and other intangible assets was $17.5 million, $17.8 million and $16.7 million in 2018, 2017 and 2016, respectively. The weighted-average useful lives of total intangible assets, client lists and other intangible assets were 6.8 years, 6.7 years and 7.8 years, respectively. Other intangible assets are amortized over periods ranging from 2 to 11 years. Based on the amount of intangible assets subject to amortization at December 31, 2018, the estimated amortization expense is $13.6 million for 2019, $12.3 million for 2020, $10.8 million for 2021, $9.0 million for 2022 and $7.9 million for 2023.

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- Definition The entire disclosure for goodwill and intangible assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -URI http://asc.fasb.org/topic&trid=2144416 + Details
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