Fixed Assets (Tables)

3 Months Ended

Mar. 31, 2016

Fixed Assets And Asset Retirement Obligations [Abstract]

Schedule Of Fixed Assets

Fixed assets consisted of the following:

	March 31, 2016			December 31, 2015
Crude oil pipelines and natural gas pipelines and related assets	$	2,656,905		$	2,501,821
Machinery and equipment	414,707			414,100
Transportation equipment	18,323			19,025
Marine vessels	803,581			794,508
Land, buildings and improvements	46,462			41,202
Office equipment, furniture and fixtures	7,869			7,540
Construction in progress	481,887			485,575
Other	46,915			46,455
Fixed assets, at cost	4,476,649			4,310,226
Less: Accumulated depreciation	(416,425		)	(378,247		)
Net fixed assets	$	4,060,224		$	3,931,979

Depreciation Expense

Our depreciation expense for the periods presented was as follows:

	Three Months Ended March 31,
	2016		2015
Depreciation expense	$	39,712	$	22,037

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	2,540
Change in estimate	817
Settlements	(71		)
ARO liability balance, March 31, 2016	$	212,888

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	$	7,982
	2017	$	9,671
	2018	$	7,948
	2019	$	8,464
	2020	$	9,014