Properties, Plants and Equipment

12 Months Ended

Dec. 31, 2016

Property, Plant and Equipment [Abstract]

Properties, Plants and Equipment

Properties, Plants and Equipment

The components of properties, plants and equipment are as follows:

	December 31,
	2016			2015
	(In thousands)
Land, buildings and improvements	$	326,097		$	305,712
Refining facilities	3,382,369			2,833,125
Pipelines and terminals	1,392,898			1,321,398
Transportation vehicles	18,841			21,289
Other fixed assets	153,463			158,401
Construction in progress	273,188			850,264
	5,546,856			5,490,189
Accumulated depreciation	(1,538,408		)	(1,374,527		)
	$	4,008,448		$	4,115,662

During the year ended December 31, 2016, we recorded impairment charges of $308.3 million that are attributable to properties, plant and equipment of our Cheyenne reporting unit. See Note 10 for additional information.

We capitalized interest attributable to construction projects of $8.0 million, $5.5 million and $11.8 million for the years ended December 31, 2016, 2015 and 2014, respectively.

Depreciation expense was $247.9 million, $233.3 million and $261.8 million for the years ended December 31, 2016, 2015 and 2014, respectively. For the years ended December 31, 2016, 2015 and 2014, depreciation expense included $62.7 million, $58.7 million and $58.1 million, respectively, attributable to HEP operations.