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Intangible Assets
 6 Months Ended
Jun. 30, 2020
Intangible Assets, Net (Excluding Goodwill) [Abstract]  
Intangible Assets Intangible Assets
The following table summarizes the components of our intangible assets at the dates indicated:
 
 June 30, 2020December 31, 2019
 Gross
Carrying
Amount		Accumulated
Amortization		Carrying
Value		Gross
Carrying
Amount		Accumulated
Amortization		Carrying
Value
Marine contract intangibles$27,800  $25,752  $2,048  $27,800  $23,033  $4,767  
Offshore pipeline contract intangibles158,101  40,912  117,189  158,101  36,752  121,349  
Other26,045  13,313  12,732  34,291  21,480  12,811  
Total$211,946  $79,977  $131,969  $220,192  $81,265  $138,927  

Our amortization of intangible assets for the periods presented was as follows:
Three Months Ended
June 30,		Six Months Ended
June 30,
2020201920202019
Amortization of intangible assets$4,146  $4,812  $8,262  $9,101  
We estimate that our amortization expense for the next five years will be as follows:
Remainder of2020$7,355  
2021$10,553  
2022$10,394  
2023$10,126  
2024$9,811