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Intangible Assets, Goodwill and Other Assets
 12 Months Ended
Dec. 31, 2020
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, 2020 and 2019:
 
  December 31, 2020December 31, 2019
 Weighted
Amortization
Period in Years		Gross
Carrying
Amount		Accumulated
Amortization		Carrying
Value		Gross
Carrying
Amount		Accumulated
Amortization		Carrying
Value
Marine contract intangibles(1)
20$800 $571 $229 $27,800 $23,033 $4,767 
Offshore pipeline contract intangibles19158,101 45,073 113,028 158,101 36,752 121,349 
Other929,244 13,759 15,485 34,291 21,480 12,811 
Total$188,145 $59,403 $128,742 $220,192 $81,265 $138,927 
(1) The marine contract intangible associated with the M/T American Phoenix became fully amortized and retired as of September 30, 2020.
    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 $15.5 million, $18.7 million and $21.8 million for the years ended December 31, 2020, 2019 and 2018, respectively.
    The following table reflects our estimated amortization expense for each of the five subsequent fiscal years:
 
20212022202320242025
Marine contract intangibles$37 $35 $34 $33 $31 
Offshore pipeline contract intangibles8,321 8,321 8,321 8,321 8,321 
Other2,595 2,438 2,171 1,857 1,691 
Total$10,953 $10,794 $10,526 $10,211 $10,043 

Goodwill
    The carrying amount of goodwill in our sodium minerals and sulfur services segment was $301.9 million at December 31, 2020 and 2019. During 2018, we recognized a goodwill impairment loss of $23.1 million related to our onshore facilities and transportation segment during the period. The goodwill impairment was specifically related to our supply and logistics reporting unit, that primarily includes our legacy crude oil and refined products marketing and trucking businesses. Due to our efforts to rightsize these businesses, along with the volatility of crude oil prices and the impact this volatility has on the availability of crude oil and heavy refined products for us to market, the fair value of the reporting unit was determined to be lower than the carrying value of the reporting unit, including goodwill. The fair value was derived using a discounted cash flow present value technique.
Other Assets
    Other assets consisted of the following:
 December 31,
 20202019
Deferred marine charges, net (1)
$20,714 $24,098 
Long-term contract assets (2)
12,065 54,232 
Other deferred costs (3)
13,068 15,755 
Other assets, net of amortization$45,847 $94,085 
(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.
(3)    Includes unamortized debt issuance costs associated with our senior secured credit facility, which were $5.8 million and $7.6 million as of December 31, 2020 and December 31, 2019, respectively. (Note 10)