Intangible Assets

3 Months Ended

Mar. 31, 2019

Intangible Assets, Net (Excluding Goodwill) [Abstract]

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



	March 31, 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		18,953		8,847		27,800		17,593		10,207
Offshore pipeline contract intangibles	158,101		30,511		127,590		158,101		28,431		129,670
Other	31,707		17,650		14,057		31,747		16,875		14,872
Total	$	217,608	$	67,114	$	150,494	$	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 March 31,
	2019		2018
Amortization of intangible assets	$	4,289	$	5,433

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



Remainder of	2019	$	12,882
	2020	$	16,167
	2021	$	10,364
	2022	$	10,205
	2023	$	9,919