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Other Intangible Assets, Net
 3 Months Ended
Mar. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]  
Other Intangible Assets, Net
Other Intangible Assets, Net

Other intangible assets, net consist of the following:
 
 
March 31, 2018
 
December 31, 2017
(in thousands)
Gross
 
Accumulated Amortization
 
Net
 
Gross
 
Accumulated Amortization
 
Net
Client lists
$
691,647

 
$
(314,706
)
 
$
376,941

 
$
690,693

 
$
(303,632
)
 
$
387,061

Non-compete agreements
28,113

 
(16,473
)
 
11,640

 
28,118

 
(15,528
)
 
12,590

Trade names and licenses
124,957

 
(51,757
)
 
73,200

 
125,090

 
(49,128
)
 
75,962

 
$
844,717

 
$
(382,936
)
 
$
461,781

 
$
843,901

 
$
(368,288
)
 
$
475,613



Amortization expense for other intangible assets, net was $15.2 million and $14.0 million for the three months ended March 31, 2018 and 2017, respectively.

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

(in thousands)
 
Remainder of 2018
$
41,981

2019
55,646

2020
55,400

2021
52,690

2022
51,020

Thereafter
205,044

 
$
461,781