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Other Intangible Assets, Net
 6 Months Ended
Jun. 30, 2018
Goodwill and Intangible Assets Disclosure [Abstract]  
Other Intangible Assets, Net
Other Intangible Assets, Net

Other intangible assets, net consist of the following:
 
 
June 30, 2018
 
December 31, 2017
(in thousands)
Gross
 
Accumulated Amortization
 
Net
 
Gross
 
Accumulated Amortization
 
Net
Client lists
$
722,255

 
$
(325,387
)
 
$
396,868

 
$
690,693

 
$
(303,632
)
 
$
387,061

Non-compete agreements
33,830

 
(17,674
)
 
16,156

 
28,118

 
(15,528
)
 
12,590

Trade names and licenses
133,544

 
(54,448
)
 
79,096

 
125,090

 
(49,128
)
 
75,962

 
$
889,629

 
$
(397,509
)
 
$
492,120

 
$
843,901

 
$
(368,288
)
 
$
475,613



Amortization expense for other intangible assets, net was $16.3 million and $13.9 million for the three months ended June 30, 2018 and 2017, respectively, and $31.5 million and $27.9 million for the six months ended June 30, 2018 and 2017, respectively.

Estimated amortization expense for other intangible assets, net is as follows:

(in thousands)
 
Remainder of 2018
$
31,135

2019
62,082

2020
60,307

2021
56,989

2022
55,521

Thereafter
226,086

 
$
492,120