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INTANGIBLE ASSETS
 12 Months Ended
Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]  
INTANGIBLE ASSETS
INTANGIBLE ASSETS
A summary of intangible assets as of December 31, 2017 and 2016 is as follows (in thousands):
 
 
December 31, 2017
 
Gross
Carrying
Amount
 
Accumulated
Amortization
 
Net
Carrying
Amount
Customer relationships
$
175,226

 
$
(38,712
)
 
$
136,514

Non-compete agreements
5,563

 
(4,509
)
 
1,054

Trade names
24,830

 
(6,211
)
 
18,619

Technology
7,867

 
(4,292
)
 
3,575

Licenses
859

 
(460
)
 
399

Total
$
214,345

 
$
(54,184
)
 
$
160,161

 
 
December 31, 2016
Gross
Carrying
Amount
 
Accumulated
Amortization
 
Net
Carrying
Amount
Customer relationships
$
174,742

 
$
(25,508
)
 
$
149,234

Non-compete agreements
5,397

 
(3,896
)
 
1,501

Trade names
24,624

 
(4,216
)
 
20,408

Technology
7,812

 
(3,364
)
 
4,448

Licenses
838

 
(325
)
 
513

Total
$
213,413

 
$
(37,309
)
 
$
176,104


Amortization expense for the years ended December 31, 2017 and 2016, the seven months ended December 31, 2015 and the year ended May 31, 2015 was, $16.5 million, $16.1 million, $5.5 million, and $3.8 million, respectively. Amortization expense for current intangible assets is forecast to be approximately $29 million in 2018, approximately $14 million per year in 2019 and 2020 and approximately $13 million per year in 2021 and 2022. The increase in forecast amortization expense for 2018 is primarily due to a change in the estimated useful life of the Furmanite trade name, to be accounted for prospectively beginning January 1, 2018. The weighted-average amortization period for intangible assets subject to amortization is 13.3 years as of December 31, 2017. The weighted-average amortization period as of December 31, 2017 is 13.5 years for customer relationships, 4.5 years for non-compete agreements, 12.5 years for trade names, 9.6 years for technology and 9.3 years for licenses.