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Other Intangible Assets, Net
 9 Months Ended
Sep. 30, 2014
Goodwill and Intangible Assets Disclosure [Abstract]  
Other Intangible Assets, Net
Other Intangible Assets, net

Other intangible assets consist of the following:
 
 
September 30, 2014
 
December 31, 2013
(in thousands)
Gross
 
Accumulated Amortization
 
Net
 
Gross
 
Accumulated Amortization
 
Net
Customer lists
$
390,897

 
$
(186,666
)
 
$
204,231

 
$
318,939

 
$
(165,578
)
 
$
153,361

Non-compete agreements
9,339

 
(7,191
)
 
2,148

 
9,150

 
(6,659
)
 
2,491

Trade names and licenses
93,783

 
(16,519
)
 
77,264

 
31,108

 
(11,152
)
 
19,956

 
$
494,019

 
$
(210,376
)
 
$
283,643

 
$
359,197

 
$
(183,389
)
 
$
175,808



Amortization expense for other intangible assets was $10.2 million and $9.1 million for the three months ended September 30, 2014 and 2013, respectively, and $27.8 million and $26.3 million for the nine months ended September 30, 2014 and 2013, respectively.

Estimated amortization expense for other intangible assets for the next five years is as follows:

(in thousands)                                     
 
Remainder of 2014
$
10,153

2015
39,661

2016
33,585

2017
31,667

2018
30,825

Thereafter
137,752

 
$
283,643