Intangible Assets (Tables)

9 Months Ended

Sep. 30, 2020

Intangible Assets, Net (Excluding Goodwill) [Abstract]

Schedule of Components of Intangible Assets

The following table summarizes the components of our intangible assets at the dates indicated:

	September 30, 2020						December 31, 2019
	Gross Carrying Amount		Accumulated Amortization		Carrying Value		Gross Carrying Amount		Accumulated Amortization		Carrying Value
Marine contract intangibles(1)	$	800	$	561	$	239	$	27,800	$	23,033	$	4,767
Offshore pipeline contract intangibles	158,101		42,992		115,109		158,101		36,752		121,349
Other	27,009		13,179		13,830		34,291		21,480		12,811
Total	$	185,910	$	56,732	$	129,178	$	220,192	$	81,265	$	138,927

(1) The contract intangible associated with the M/T American Phoenix became fully amortized and retired as of September 30, 2020.

Schedule of Amortization Expense

Our amortization of intangible assets for the periods presented was as follows:

	Three Months Ended September 30,				Nine Months Ended September 30,
	2020		2019		2020		2019
Amortization of intangible assets	$	4,555	$	4,928	$	12,817	$	14,029

Schedule of Expected Amortization Expense

We estimate that our amortization expense for the next five years will be as follows:

Remainder of	2020	$	2,781
	2021	$	10,729
	2022	$	10,571
	2023	$	10,303
	2024	$	9,988