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

Other intangible assets consist of the following:
 
 
June 30, 2014
 
December 31, 2013
(in thousands)
Gross
 
Accumulated Amortization
 
Net
 
Gross
 
Accumulated Amortization
 
Net
Customer lists
$
391,728

 
$
(177,287
)
 
$
214,441

 
$
315,639

 
$
(162,278
)
 
$
153,361

Non-compete agreements
9,349

 
(7,031
)
 
2,318

 
9,150

 
(6,659
)
 
2,491

Trade names and licenses
94,826

 
(14,546
)
 
80,280

 
31,108

 
(11,152
)
 
19,956

 
$
495,903

 
$
(198,864
)
 
$
297,039

 
$
355,897

 
$
(180,089
)
 
$
175,808



Amortization expense for other intangible assets was $10.0 million and $8.7 million for the three months ended June 30, 2014 and 2013, respectively, and $17.6 million and $17.0 million for the six months ended June 30, 2014 and 2013, respectively.

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

(in thousands)                                     
 
Remainder of 2014
$
21,120

2015
40,554

2016
34,479

2017
32,557

2018
31,453

Thereafter
136,876

 
$
297,039