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Intangible Assets, Goodwill and Other Assets
 12 Months Ended
Dec. 31, 2024
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, 2024 and 2023:
  December 31, 2024December 31, 2023
 Weighted
Amortization
Period in Years		Gross
Carrying
Amount		Accumulated
Amortization		Carrying
Value		Gross
Carrying
Amount		Accumulated
Amortization		Carrying
Value
Offshore pipeline contract intangible19$158,101 $78,357 $79,744 $158,101 $70,036 $88,065 
Other937,630 20,089 17,541 70,974 17,502 53,472 
Total$195,731 $98,446 $97,285 $229,075 $87,538 $141,537 

The offshore pipeline contract intangible relates to customer contracts surrounding certain transportation agreements with producers in the Lucius production area in Southeast Keathley Canyon, which support our SEKCO pipeline.
We record 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 $11.9 million, $11.6 million and $10.3 million for the years ended December 31, 2024, 2023 and 2022, respectively.
In the fourth quarter of 2024, we terminated an on-going project related to the integration of certain of our enterprise resource planning systems and we impaired the costs incurred to date. As a result, we recognized an impairment charge of $43.0 million for the year ended December 31, 2024 included within “Impairment expense” on the Consolidated Statement of Operations.
The following table reflects our estimated amortization expense for each of the five subsequent fiscal years:
 
20252026202720282029
Offshore pipeline contract intangibles$8,321 $8,321 $8,321 $8,321 $8,321 
Other3,435 3,006 2,427 1,801 1,769 
Total$11,756 $11,327 $10,748 $10,122 $10,090 
Goodwill
The carrying amount of goodwill in our soda and sulfur services segment was $302.0 million at December 31, 2024 and December 31, 2023. 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,
 20242023
Deferred marine charges, net (1)
$28,492 $19,651 
Unamortized debt issuance costs on senior secured credit facility (Note 11)
7,890 5,676 
Other deferred charges, net(2)
18,720 12,914 
Other assets, net of amortization$55,102 $38,241 
(1)    See discussion of deferred charges on marine transportation assets in the Summary of Accounting Policies (Note 2).
(2)    Includes $5.2 million of contract assets in accordance with ASC 606 (refer to Note 3).