Intangible Assets

9 Months Ended

Sep. 30, 2019

Intangible Assets, Net (Excluding Goodwill) [Abstract]

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



	September 30, 2019						December 31, 2018
	Gross Carrying Amount		Accumulated Amortization		Carrying Value		Gross Carrying Amount		Accumulated Amortization		Carrying Value
Intangibles associated with lease ⁽¹⁾	$	—	$	—	$	—	$	13,260	$	5,407	$	7,853
Marine contract intangibles	27,800		21,674		6,126		27,800		17,593		10,207
Offshore pipeline contract intangibles	158,101		34,671		123,430		158,101		28,431		129,670
Other	33,555		20,396		13,159		31,747		16,875		14,872
Total	$	219,456	$	76,741	$	142,715	$	230,908	$	68,306	$	162,602

(1) Intangible assets associated with a lease in our onshore facilities & transportation segment are now classified as part of our Right or Use Assets, net as part of our adoption of ASC 842 as of January 1, 2019 (Note 4).

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



	Three Months Ended September 30,				Nine Months Ended September 30,
	2019		2018		2019		2018
Amortization of intangible assets	$	4,928	$	5,475	$	14,029	$	16,369

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



Remainder of	2019	$	4,333
	2020	$	15,463
	2021	$	10,417
	2022	$	10,258
	2023	$	9,975