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Intangible and Other Non-Current Assets
 3 Months Ended
Mar. 31, 2021
Goodwill and Intangible Assets Disclosure [Abstract]  
Intangible and Other Non-Current Assets Intangible and Other Non-Current Assets
A summary of intangible and other non-current assets at March 31, 2021 and December 31, 2020, and amortization expense for the three months ended March 31, 2021 and 2020, is as follows (in thousands):
March 31, 2021December 31, 2020
Amortizable lives
(in years)		Gross carrying amountAccumulated amortizationNet book valueGross carrying amountAccumulated amortizationNet book value
Brand
15-17
$18,000 $10,295 $7,705 $18,000 $10,030 $7,970 
Distributor relationships
10-14
2,700 1,878 822 2,700 1,829 871 
Customer relationships71,900 1,900 — 1,900 1,900 — 
Legacy permits14250 175 75 250 171 79 
Trademark20200 126 74 200 123 77 
Total$23,050 $14,374 $8,676 $23,050 $14,053 $8,997 
Other non-current assets236 241 
Total intangible and other non-current assets, net$8,912 $9,238 
Three Months Ended March 31,
Amortization expense20212020
Total amortization expense$321 $321 

The estimated aggregate future amortization of intangible assets as of March 31, 2021 is identified below (in thousands):
Amortization
Remainder of 2021$965 
20221,286 
20231,286 
20241,286 
20251,168 
Thereafter2,685 
Total$8,676