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Intangible Assets, Goodwill and Other Assets
 12 Months Ended
Dec. 31, 2023
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, 2023 and 2022:
  December 31, 2023December 31, 2022
 Weighted
Amortization
Period in Years		Gross
Carrying
Amount		Accumulated
Amortization		Carrying
Value		Gross
Carrying
Amount		Accumulated
Amortization		Carrying
Value
Offshore pipeline contract intangibles19158,101 70,036 88,065 158,101 61,715 96,386 
Other1070,974 17,502 53,472 45,191 14,257 30,934 
Total$229,075 $87,538 $141,537 $203,292 $75,972 $127,320 

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 $11.6 million, $10.3 million and $10.3 million for the years ended December 31, 2023, 2022 and 2021, respectively.
The following table reflects our estimated amortization expense for each of the five subsequent fiscal years:
 
20242025202620272028
Offshore pipeline contract intangibles$8,321 $8,321 $8,321 $8,321 $8,321 
Other6,504 6,244 5,932 5,485 5,235 
Total$14,825 $14,565 $14,253 $13,806 $13,556 
Goodwill
The carrying amount of goodwill in our soda and sulfur services segment was $301.9 million at December 31, 2023 and December 31, 2022. 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,
 20232022
Deferred marine charges, net (1)
$19,651 $20,503 
Unamortized debt issuance costs on senior secured credit facility5,676 2,591 
Other deferred charges, net12,914 9,114 
Other assets, net of amortization$38,241 $32,208 
(1)    See discussion of deferred charges on marine transportation assets in the Summary of Accounting Policies (Note 2).