Property, Plant and Equipment

12 Months Ended

Dec. 31, 2018

Property, Plant and Equipment [Abstract]

Property, Plant and Equipment

PROPERTY, PLANT AND EQUIPMENT

Property, plant and equipment consists of the following (in thousands):

	December 31,
	2018			2017
Land	$	308,166		$	273,168
Pipelines and related facilities	1,023,502			926,799
Storage and terminal facilities	1,247,115			1,111,001
Natural gas gathering and processing facilities	1,055,305			940,130
Linefill	27,972			25,747
Trucking equipment and other	45,567			45,162
Office property and equipment	69,498			63,052
Construction-in-progress	288,104			374,914
Property, plant and equipment, gross	4,065,229			3,759,973
Accumulated depreciation	(607,903		)	(444,842		)
Property, plant and equipment, net	$	3,457,326		$	3,315,131

Land in the table above includes $120.2 million and $106.2 million of rights-of-way at December 31, 2018 and 2017, respectively. The weighted average remaining useful life of rights-of-way at December 31, 2018, was approximately 19 years.

We recorded depreciation expense of $173.1 million, $126.3 million and $87.9 million for the years ended December 31, 2018, 2017 and 2016, respectively.

We include within the cost of property, plant and equipment interest costs incurred while an asset is being constructed. We capitalized $12.6 million, $18.4 million and $17.0 million of interest costs during the years ended December 31, 2018, 2017 and 2016, respectively.