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Other Intangible Assets
 9 Months Ended
Sep. 30, 2018
Goodwill and Intangible Assets Disclosure [Abstract]  
Other Intangible Assets
OTHER INTANGIBLE ASSETS
Intangible assets with finite useful lives are amortized over estimated useful lives on a straight-line basis. Our intangible assets, which arose in connection with our acquisition of the HNZ Offshore Business, consist of the following (in thousands):
 
Estimated Useful Lives
 
Gross Amount at December 31, 2017
 
Accumulated Amortization
 
Net Balance at September 30, 2018
Customer Relationship
15
 
$
11,622

 
$
(581
)
 
$
11,041

Non-Compete Agreements
5
 
900

 
(135
)
 
765

Trade Names
7
 
4,201

 
(450
)
 
3,751

Total
 
 
$
16,723

 
$
(1,166
)
 
$
15,557


Based on the carrying values of our intangible assets at September 30, 2018, we estimate our amortization expense for the next five years (2018 through 2022) to be $1.6 million per year. For the quarter and nine months ended September 30, 2018, amortization expense was $0.4 million and $1.2 million, respectively.