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Other Intangible Assets, Net
 9 Months Ended
Sep. 30, 2013
Goodwill and Intangible Assets Disclosure [Abstract]  
Other Intangible Assets, Net
Other Intangible Assets, net

Other intangible assets consist of the following:
 
 
September 30, 2013
 
December 31, 2012
(in thousands)
Gross
 
Accumulated Amortization
 
Net
 
Gross
 
Accumulated Amortization
 
Net
Customer lists
$
320,432

 
$
(159,669
)
 
$
160,763

 
$
286,164

 
$
(137,782
)
 
$
148,382

Non-compete agreements
9,156

 
(6,331
)
 
2,825

 
9,264

 
(5,438
)
 
3,826

Trade names and licenses
30,867

 
(10,476
)
 
20,391

 
27,853

 
(8,477
)
 
19,376

 
$
360,455

 
$
(176,476
)
 
$
183,979

 
$
323,281

 
$
(151,697
)
 
$
171,584



Amortization expense for other intangible assets was $9.1 million and $7.1 million for the three months ended September 30, 2013 and 2012, respectively, and $26.3 million and $20.5 million for the nine months ended September 30, 2013 and 2012, respectively.

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

(in thousands)                                     
 
Remainder of 2013
$
8,037

2014
30,385

2015
28,796

2016
22,667

2017
20,360

Thereafter
73,734

 
$
183,979