Intangible Assets (Tables)

9 Months Ended

Sep. 30, 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:

	September 30, 2021						December 31, 2020
	Gross Carrying Amount		Accumulated Amortization		Carrying Value		Gross Carrying Amount		Accumulated Amortization		Carrying Value
Marine contract intangibles	$	800	$	599	$	201	$	800	$	571	$	229
Offshore pipeline contract intangibles	158,101		51,313		106,788		158,101		45,073		113,028
Other	35,401		15,242		20,159		29,244		13,759		15,485
Total	$	194,302	$	67,154	$	127,148	$	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 September 30,				Nine Months Ended September 30,
	2021		2020		2021		2020
Amortization of intangible assets	$	2,575	$	4,555	$	7,755	$	12,817

Schedule of Expected Amortization Expense

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

Remainder of	2021	$	2,874
	2022	$	11,421
	2023	$	11,153
	2024	$	10,838
	2025	$	10,684