Fixed Assets (Tables)

6 Months Ended

Jun. 30, 2016

Fixed Assets And Asset Retirement Obligations [Abstract]

Schedule Of Fixed Assets

Fixed assets consisted of the following:

	June 30, 2016			December 31, 2015
Crude oil pipelines and natural gas pipelines and related assets	$	2,657,642		$	2,501,821
Machinery and equipment	418,013			414,100
Transportation equipment	18,991			19,025
Marine vessels	821,895			794,508
Land, buildings and improvements	49,431			41,202
Office equipment, furniture and fixtures	9,347			7,540
Construction in progress	566,804			485,575
Other	46,915			46,455
Fixed assets, at cost	4,589,038			4,310,226
Less: Accumulated depreciation	(463,244		)	(378,247		)
Net fixed assets	$	4,125,794		$	3,931,979

Depreciation Expense

Our depreciation expense for the periods presented was as follows:

	Three Months Ended June 30,				Six Months Ended June 30,
	2016		2015		2016		2015
Depreciation expense	$	48,807	$	22,512	$	88,519	$	44,549

Schedule of Change in Asset Retirement Obligation

The following table presents information regarding our AROs since December 31, 2015:

ARO liability balance, December 31, 2015	$	188,662
AROs arising from the purchase of the remaining interest in Deepwater Gateway	10,470
AROs from the consolidation of historical interest in Deepwater Gateway	10,470
Accretion expense	5,079
Change in estimate	4,590
Settlements	(2,071		)
ARO liability balance, June 30, 2016	$	217,200

Schedule of Asset Retirement Obligations

With respect to our AROs, the following table presents our forecast of accretion expense for the periods indicated:

Remainder of	2016	$	5,473
	2017	$	9,900
	2018	$	8,204
	2019	$	8,731
	2020	$	9,293