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INTANGIBLE ASSETS
 6 Months Ended
Jun. 30, 2019
Goodwill and Intangible Assets Disclosure [Abstract]  
INTANGIBLE ASSETS
INTANGIBLE ASSETS
A summary of intangible assets as of June 30, 2019 and December 31, 2018 is as follows (in thousands): 
 
June 30, 2019
 
December 31, 2018
 
(unaudited)
 
 
 
 
 
 
 
Gross
Carrying
Amount
 
Accumulated
Amortization
 
Net
Carrying
Amount
 
Gross
Carrying
Amount
 
Accumulated
Amortization
 
Net
Carrying
Amount
Customer relationships
$
174,933

 
$
(57,466
)
 
$
117,467

 
$
174,894

 
$
(51,160
)
 
$
123,734

Non-compete agreements
5,469

 
(5,163
)
 
306

 
5,433

 
(4,882
)
 
551

Trade names
24,742

 
(20,871
)
 
3,871

 
24,753

 
(20,594
)
 
4,159

Technology
7,844

 
(5,601
)
 
2,243

 
7,847

 
(5,187
)
 
2,660

Licenses
850

 
(612
)
 
238

 
851

 
(583
)
 
268

Total
$
213,838

 
$
(89,713
)
 
$
124,125

 
$
213,778

 
$
(82,406
)
 
$
131,372


Amortization expense for the three months ended June 30, 2019 and June 30, 2018 was $3.7 million and $7.1 million, respectively. Amortization expense for the six months ended June 30, 2019 and 2018 was $7.2 million and $14.3 million, respectively.