Property, Plant and Equipment

12 Months Ended

Dec. 31, 2017

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,
	2017			2016
Land	$	273,168		$	90,337
Pipelines and related facilities	926,799			398,053
Storage and terminal facilities	1,111,001			279,506
Natural gas gathering and processing facilities	940,130			874,704
Linefill	25,747			25,804
Trucking equipment and other	45,162			45,417
Office property and equipment	63,052			61,146
Construction-in-progress	374,914			380,740
Property, plant and equipment, gross	3,759,973			2,155,707
Accumulated depreciation	(444,842		)	(393,635		)
Property, plant and equipment, net	$	3,315,131		$	1,762,072

Land in the table above includes $106.2 million and $76.8 million of rights-of-way at December 31, 2017 and 2016, respectively. The weighted average remaining useful life of rights-of-way at December 31, 2017 was approximately 20 years.

We recorded depreciation expense of $126.3 million, $87.9 million and $90.5 million for the years ended December 31, 2017, 2016 and 2015, respectively.

We include within the cost of property, plant and equipment interest costs incurred while an asset is being constructed. We capitalized $18.4 million, $17.0 million and $1.0 million of interest costs during the years ended December 31, 2017, 2016 and 2015, respectively.