Intangible Assets (Tables)

6 Months Ended

Jun. 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:

	June 30, 2021						December 31, 2020
	Gross Carrying Amount		Accumulated Amortization		Carrying Value		Gross Carrying Amount		Accumulated Amortization		Carrying Value
Marine contract intangibles	$	800	$	589	$	211	$	800	$	571	$	229
Offshore pipeline contract intangibles	158,101		49,233		108,868		158,101		45,073		113,028
Other	33,629		14,761		18,868		29,244		13,759		15,485
Total	$	192,530	$	64,583	$	127,947	$	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 June 30,				Six Months Ended June 30,
	2021		2020		2021		2020
Amortization of intangible assets	$	2,580	$	4,146	$	5,180	$	8,262

Schedule of Expected Amortization Expense

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

Remainder of	2021	$	5,673
	2022	$	11,244
	2023	$	10,976
	2024	$	10,661
	2025	$	10,494