Quarterly report pursuant to Section 13 or 15(d)

Intangible Assets

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Intangible Assets
3 Months Ended
Mar. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]  
Intangible Assets
3. Intangible Assets

 

The carrying amounts of intangible assets subject to amortization are included within other long-term assets. The gross carrying amounts of intangible assets, the related accumulated amortization, the net carrying amounts and the weighted-average amortization periods of the Company’s intangible assets are listed in the following tables (in thousands, except amortization period):

 

    March 31, 2018  
    Gross Carrying
Amount
    Accumulated
Amortization
    Net Carrying
Amount
    Weighted-
Average
Amortization
Period (Years)
 
Customer relationships   $ 120,000     $ (73,088 )   $ 46,912       6.0  
Licenses     3,368       (1,883 )     1,485       5.6  
Total intangible assets subject to amortization   $ 123,368     $ (74,971 )   $ 48,397          

 

    December 31, 2017  
    Gross Carrying
Amount
    Accumulated
Amortization
    Net Carrying
Amount
    Weighted-
Average
Amortization
Period (Years)
 
Customer relationships   $ 120,000     $ (66,866 )   $ 53,134       6.0  
Licenses     3,368       (1,601 )     1,767       5.6  
Non-compete agreements     660       (660 )           1.0  
Total intangible assets subject to amortization   $ 124,028     $ (69,127 )   $ 54,901          

 

The aggregate amortization expense is as follows (in thousands):

 

    Three Months Ended
March 31,
 
    2018     2017  
Amortization expense   $ 6,504     $ 7,915  

 

The following table sets forth the Company’s estimated aggregate amortization expense for each of the five years below (in thousands):

 

Year ended December 31,   Amortization
Expense
 
2019   $ 18,489  
2020     9,906  
2021     75  
2022     75  
2023     75