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Intangible Assets, Goodwill and Other Assets
 12 Months Ended
Dec. 31, 2022
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, 2022 and 2021:
  December 31, 2022December 31, 2021
 Weighted
Amortization
Period in Years		Gross
Carrying
Amount		Accumulated
Amortization		Carrying
Value		Gross
Carrying
Amount		Accumulated
Amortization		Carrying
Value
Marine contract intangibles20$800 $642 $158 $800 $607 $193 
Offshore pipeline contract intangibles19158,101 61,715 96,386 158,101 53,394 104,707 
Other1044,391 13,615 30,776 37,933 15,770 22,163 
Total$203,292 $75,972 $127,320 $196,834 $69,771 $127,063 

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, $10.3 million and $15.5 million for the years ended December 31, 2022, 2021 and 2020, respectively.
The following table reflects our estimated amortization expense for each of the five subsequent fiscal years:
 
20232024202520262027
Marine contract intangibles$34 $33 $32 $30 $29 
Offshore pipeline contract intangibles8,321 8,321 8,321 8,321 8,321 
Other4,216 3,852 3,628 3,330 2,884 
Total$12,571 $12,206 $11,981 $11,681 $11,234 
Goodwill
The carrying amount of goodwill in our sodium minerals and sulfur services segment was $301.9 million at December 31, 2022 and 2021. 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,
 20222021
Deferred marine charges, net (1)
$20,503 $19,930 
Unamortized debt issuance costs on senior secured credit facility2,591 4,736 
Other deferred costs9,114 13,593 
Other assets, net of amortization$32,208 $38,259 
(1)    See discussion of deferred charges on marine transportation assets in the Summary of Accounting Policies (Note 2).