Property, Plant and Equipment (Tables)

12 Months Ended

Dec. 31, 2017

Property, Plant and Equipment [Abstract]

Property, Plant and Equipment

Depreciation is computed using the straight-line method over management’s estimated useful lives of the related assets, except for automotive equipment, which is depreciated using a declining-balance method. The estimated useful lives are as follows:

	Years
Buildings and building improvements	15-40
Pipelines, tanks and terminals	15-40
Asset retirement obligation assets	15-50
Other equipment	3-15

Property, plant and equipment, at cost, consist of the following (in thousands):

	December 31,
	2017			2016
Land and land improvements	$	4,440		$	4,435
Building and building improvements	2,804			2,236
Pipelines, tanks and terminals	314,251			305,302
Asset retirement obligation assets	2,073			2,073
Other equipment	14,650			12,925
Construction in process	28,961			15,436
	367,179			342,407
Less: accumulated depreciation	(112,111		)	(91,378		)
	$	255,068		$	251,029

Property, plant and equipment, accumulated depreciation and depreciation expense by reporting segment as of and for the years ended December 31, 2017 and 2016 are as follows (in thousands):

	As of and For the Year Ended December 31, 2017
	Pipelines and Transportation			Wholesale Marketing and Terminalling			Consolidated
Property, plant and equipment	$	300,134		$	67,045		$	367,179
Less: accumulated depreciation	(84,435		)	(27,676		)	(112,111		)
Property, plant and equipment, net	$	215,699		$	39,369		$	255,068
Depreciation expense	$	17,268		$	3,583		$	20,851

	As of and For the Year Ended December 31, 2016
	Pipelines and Transportation			Wholesale Marketing and Terminalling			Consolidated
Property, plant and equipment	$	279,155		$	63,252		$	342,407
Less: Accumulated depreciation	(67,032		)	(24,346		)	(91,378		)
Property, plant and equipment, net	$	212,123		$	38,906		$	251,029
Depreciation expense	$	16,133		$	3,617		$	19,750