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Intangible Assets
9 Months Ended
Sep. 30, 2018
Goodwill and Intangible Assets Disclosure [Abstract]  
Intangible Assets Intangible Assets
Basic had trade names of $3.4 million as of September 30, 2018 and December 31, 2017. Trade names have a 15-year life and are tested for impairment when triggering events are identified.

Basic’s intangible assets were as follows (in thousands):
September 30, 2018December 31, 2017
Trade names
$3,410 $3,410 
Other intangible assets
48 48 
Intangible assets  3,458 3,458 
Less accumulated amortization
415 237 
Intangible assets subject to amortization, net
$3,043 $3,221 
 
Amortization expense of intangible assets for the three and nine months ended September 30, 2018 and 2017 was as follows (in thousands):
Three Months Ended September 30, Nine Months Ended September 30, 
2018201720182017
Intangible amortization expense
$60 $60 $178 $178