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Intangible Assets, Goodwill and Other Assets (Tables)
 12 Months Ended
Dec. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of 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.
Schedule of Estimated Amortization Expense 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 
Schedule of 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)