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Properties, Plants and Equipment
 12 Months Ended
Dec. 31, 2018
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,
 
 
2018
 
2017
 
 
(In thousands)
Land, buildings and improvements
 
$
455,508

 
$
442,214

Refining facilities
 
4,034,546

 
3,904,161

Pipelines and terminals
 
1,729,994

 
1,484,502

Transportation vehicles
 
20,311

 
20,394

Other fixed assets
 
296,843

 
467,469

Construction in progress
 
243,778

 
205,049

 
 
6,780,980

 
6,523,789

Accumulated depreciation
 
(2,098,446
)
 
(1,810,515
)
 
 
$
4,682,534

 
$
4,713,274



We capitalized interest attributable to construction projects of $4.8 million, $5.0 million and $8.0 million for the years ended December 31, 2018, 2017 and 2016, respectively.

Depreciation expense was $309.0 million, $286.5 million and $247.9 million for the years ended December 31, 2018, 2017 and 2016, respectively.