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Intangible Assets, Net
 3 Months Ended
Mar. 31, 2018
Intangible Assets, Net (Excluding Goodwill) [Abstract]  
Intangible Assets, Net
Intangible Assets, Net
Intangible assets, net, consisted of the following (in thousands):
 
March 31, 2018
 
December 31, 2017
 
Carrying Amount
 
Accumulated Amortization
 
Net Carrying Amount
 
Carrying Amount
 
Accumulated Amortization
 
Net Carrying Amount
Customer relationships
$
57,605

 
$
(13,553
)
 
$
44,052

 
$
56,688

 
$
(11,764
)
 
$
44,924

Trademarks
2,900

 
(1,058
)
 
1,842

 
2,900

 
(938
)
 
1,962

Developed technology
6,435

 
(4,613
)
 
1,822

 
6,237

 
(4,036
)
 
2,201

 
$
66,940

 
$
(19,224
)
 
$
47,716

 
$
65,825

 
$
(16,738
)
 
$
49,087



As of March 31, 2018, the Company expects amortization expense in future periods to be as follows (in thousands):
2018 (remainder)
$
6,540

2019
6,739

2020
6,615

2021
6,615

2022
6,160

Thereafter
15,047

Total estimated future amortization expense
$
47,716



Amortization expense related to the Company's intangible assets was $2.2 million and $2.3 million for the three months ended March 31, 2018 and 2017, respectively.