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INTANGIBLE ASSETS
 6 Months Ended
Jun. 30, 2016
Goodwill and Intangible Assets Disclosure [Abstract]  
INTANGIBLE ASSETS
INTANGIBLE ASSETS
A summary of intangible assets as of June 30, 2016 and December 31, 2015 is as follows (in thousands):
 
 
June 30, 2016
 
December 31, 2015
 
(unaudited)
 
 
 
 
 
 
 
Gross
Carrying
Amount
 
Accumulated
Amortization
 
Net
Carrying
Amount
 
Gross
Carrying
Amount
 
Accumulated
Amortization
 
Net
Carrying
Amount
Customer relationships
$
156,840

 
$
(18,368
)
 
$
138,472

 
$
103,288

 
$
(12,995
)
 
$
90,293

Non-compete agreements
5,477

 
(3,711
)
 
1,766

 
4,898

 
(3,468
)
 
1,430

Trade names
24,710

 
(3,249
)
 
21,461

 
6,299

 
(1,940
)
 
4,359

Technology
7,834

 
(2,918
)
 
4,916

 
5,112

 
(2,541
)
 
2,571

Licenses
846

 
(265
)
 
581

 
683

 
(217
)
 
466

Total
$
195,707

 
$
(28,511
)
 
$
167,196

 
$
120,280

 
$
(21,161
)
 
$
99,119


Amortization expense for the three months ended June 30, 2016 and 2015 was $4.1 million and $0.9 million, respectively. Amortization expense for the six months ended June 30, 2016 and 2015 was $7.2 million and $1.9 million, respectively.