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Other Intangible Assets, Net
 3 Months Ended
Mar. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]  
Other Intangible Assets, Net
Other Intangible Assets, Net

Other intangible assets, net consist of the following:
 
 
March 31, 2017
 
December 31, 2016
(in thousands)
Gross
 
Accumulated Amortization
 
Net
 
Gross
 
Accumulated Amortization
 
Net
Client lists
$
639,479

 
$
(269,514
)
 
$
369,965

 
$
637,053

 
$
(257,787
)
 
$
379,266

Non-compete agreements
28,108

 
(12,233
)
 
15,875

 
28,106

 
(11,136
)
 
16,970

Trade names and licenses
121,626

 
(41,333
)
 
80,293

 
121,086

 
(38,409
)
 
82,677

 
$
789,213

 
$
(323,080
)
 
$
466,133

 
$
786,245

 
$
(307,332
)
 
$
478,913



Amortization expense for other intangible assets, net was $14.0 million and $11.7 million for the three months ended March 31, 2017 and 2016, respectively.

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

(in thousands)
 
Remainder of 2017
$
41,923

2018
55,215

2019
52,680

2020
50,950

2021
46,994

Thereafter
218,371

 
$
466,133