Intangible Assets (Tables)

3 Months Ended

Mar. 31, 2021

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:

	March 31, 2021						December 31, 2020
	Gross Carrying Amount		Accumulated Amortization		Carrying Value		Gross Carrying Amount		Accumulated Amortization		Carrying Value
Marine contract intangibles	$	800	$	580	$	220	$	800	$	571	$	229
Offshore pipeline contract intangibles	158,101		47,153		110,948		158,101		45,073		113,028
Other	30,949		14,269		16,680		29,244		13,759		15,485
Total	$	189,850	$	62,002	$	127,848	$	188,145	$	59,403	$	128,742

Schedule of Amortization Expense

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

	Three Months Ended March 31,
	2021		2020
Amortization of intangible assets	$	2,600	$	4,116

Schedule of Expected Amortization Expense

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

Remainder of	2021	$	8,323
	2022	$	10,973
	2023	$	10,705
	2024	$	10,390
	2025	$	10,222