Goodwill and Other Intangible Assets, Net

12 Months Ended

Dec. 31, 2018

Goodwill And Intangible Assets Disclosure [Abstract]

Goodwill and Other Intangible Assets, Net

Note5. 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.