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Other Intangible Assets, Net
 6 Months Ended
Jun. 30, 2017
Goodwill and Intangible Assets Disclosure [Abstract]  
Other Intangible Assets, Net
Other Intangible Assets, Net

Other intangible assets, net consist of the following:
 
 
June 30, 2017
 
December 31, 2016
(in thousands)
Gross
 
Accumulated Amortization
 
Net
 
Gross
 
Accumulated Amortization
 
Net
Client lists
$
643,645

 
$
(280,449
)
 
$
363,196

 
$
637,053

 
$
(257,787
)
 
$
379,266

Non-compete agreements
28,112

 
(13,332
)
 
14,780

 
28,106

 
(11,136
)
 
16,970

Trade names and licenses
118,854

 
(43,659
)
 
75,195

 
121,086

 
(38,409
)
 
82,677

 
$
790,611

 
$
(337,440
)
 
$
453,171

 
$
786,245

 
$
(307,332
)
 
$
478,913



Amortization expense for other intangible assets, net was $13.9 million and $13.2 million for the three months ended June 30, 2017 and 2016, respectively, and $27.9 million and $24.9 million for the six months ended June 30, 2017 and 2016, respectively.

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

(in thousands)
 
Remainder of 2017
$
27,890

2018
55,119

2019
52,692

2020
50,490

2021
47,342

Thereafter
219,638

 
$
453,171