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Other Intangible Assets
 6 Months Ended
Jun. 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 June 30, 2018
Customer Relationship
15
 
$
11,622

 
$
(387
)
 
$
11,235

Non-Compete Agreements
5
 
900

 
(90
)
 
810

Tradenames
7
 
4,201

 
(300
)
 
3,901

Total
 
 
$
16,723

 
$
(777
)
 
$
15,946


Based on the carrying values of our intangible assets at June 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 six months ended June 30, 2018, amortization expense was $0.4 million and $0.8 million, respectively.