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Intangible Assets
 6 Months Ended
Jun. 30, 2020
Goodwill and Intangible Assets Disclosure [Abstract]  
Intangible Assets
Intangible Assets

Intangible assets consist of the following:
 
June 30, 2020
 
Gross Carrying Amount
 
Accumulated Amortization
 
Net
 
Remaining Useful Life (Years)
Disposal permits
$
540

 
$
(311
)
 
$
229

 
5.0
Trade name
799

 
(621
)
 
178

 
0.6
Total intangible assets
$
1,339

 
$
(932
)
 
$
407

 
3.1


 
December 31, 2019
 
Gross Carrying Amount
 
Accumulated Amortization
 
Net
 
Remaining Useful Life (Years)
Disposal permits
$
554

 
$
(269
)
 
$
285

 
5.0
Trade name
799

 
(444
)
 
355

 
1.0
Total intangible assets
$
1,353

 
$
(713
)
 
$
640

 
2.8

The gross carrying value of the disposal permits decreased by $27.0 thousand during the year ended December 31, 2019 due to the sale of disposal permits in the Northeast and Southern divisions. The disposal permits are related to the Rocky Mountain, Northeast and Southern divisions. The remaining weighted average useful lives shown are calculated based on the net book value and remaining amortization period of each respective intangible asset.

Amortization expense was $0.1 million and $0.1 million for the three months ended June 30, 2020 and June 30, 2019, respectively, and $0.2 million and $0.2 million for the six months ended June 30, 2020 and June 30, 2019, respectively.