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Intangible Assets, Goodwill and Other Assets
 12 Months Ended
Dec. 31, 2021
Goodwill and Intangible Assets Disclosure [Abstract]  
Intangible Assets, Goodwill and Other Assets Intangible Assets, Goodwill and Other Assets
Intangible Assets
The following table reflects the components of intangible assets being amortized at December 31, 2021 and 2020:
  December 31, 2021December 31, 2020
 Weighted
Amortization
Period in Years		Gross
Carrying
Amount		Accumulated
Amortization		Carrying
Value		Gross
Carrying
Amount		Accumulated
Amortization		Carrying
Value
Marine contract intangibles20$800 $607 $193 $800 $571 $229 
Offshore pipeline contract intangibles19158,101 53,394 104,707 158,101 45,073 113,028 
Other937,933 15,770 22,163 29,244 13,759 15,485 
Total$196,834 $69,771 $127,063 $188,145 $59,403 $128,742 

The offshore pipeline contract intangibles relate to customer contracts surrounding certain transportation agreements with producers in the Lucius production area in Southeast Keathley Canyon, which support our SEKCO pipeline.
We are recording amortization of our intangible assets based on the period over which the asset is expected to contribute to our future cash flows. All of our current intangible assets are being amortized on a straight-line basis. Amortization expense on intangible assets was $10.3 million, $15.5 million and $18.7 million for the years ended December 31, 2021, 2020 and 2019, respectively. The decline in amortization expense during 2021 was primarily attributable to our contract intangible associated with the M/T American Phoenix becoming fully amortized at September 30, 2020.
The following table reflects our estimated amortization expense for each of the five subsequent fiscal years:
 
20222023202420252026
Marine contract intangibles$35 $34 $33 $32 $30 
Offshore pipeline contract intangibles8,321 8,321 8,321 8,321 8,321 
Other3,414 3,147 2,783 2,560 2,261 
Total$11,770 $11,502 $11,137 $10,913 $10,612 
Goodwill
The carrying amount of goodwill in our sodium minerals and sulfur services segment was $301.9 million at December 31, 2021 and 2020. We have not recognized any impairment losses related to goodwill for any of the periods presented.
Other Assets
Other assets consisted of the following:
 December 31,
 20212020
Deferred marine charges, net (1)
$19,930 $20,714 
Long-term contract assets (2)
— 12,065 
Unamortized debt issuance costs on Revolving Loan4,736 5,842 
Other deferred costs13,593 7,226 
Other assets, net of amortization$38,259 $45,847 
(1)    See discussion of deferred charges on marine transportation assets in the Summary of Accounting Policies (Note 2).
(2)    See Revenue Recognition (Note 3) for discussion on the circumstances that result in the recognition of contract assets.