Intangible Assets (Tables)

6 Months Ended

Jun. 30, 2019

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, 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		20,313		7,487		27,800		17,593		10,207
Offshore pipeline contract intangibles	158,101		32,591		125,510		158,101		28,431		129,670
Other	33,123		18,942		14,181		31,747		16,875		14,872
Total	$	219,024	$	71,846	$	147,178	$	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).

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,
	2019		2018		2019		2018
Amortization of intangible assets	$	4,812	$	5,461	$	9,101	$	10,894

Schedule of Expected Amortization Expense

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



Remainder of	2019	$	8,616
	2020	$	15,910
	2021	$	10,421
	2022	$	10,247
	2023	$	9,975