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Properties, Plants and Equipment
12 Months Ended
Dec. 31, 2013
Property, Plant and Equipment [Abstract]  
Properties, Plants and Equipment
Properties, Plants and Equipment

 
 
December 31,
 
 
2013
 
2012
 
 
(In thousands)
Land, buildings and improvements
 
$
235,625

 
$
198,610

Refining facilities
 
2,510,750

 
2,261,733

Pipelines and terminals
 
1,158,288

 
1,113,080

Transportation vehicles
 
41,066

 
29,970

Other fixed assets
 
116,801

 
105,075

Construction in progress
 
281,327

 
234,646

 
 
4,343,857

 
3,943,114

Accumulated depreciation
 
(949,261
)
 
(748,414
)
 
 
$
3,394,596

 
$
3,194,700



We capitalized interest attributable to construction projects of $12.1 million, $9.1 million and $17.2 million for the years ended December 31, 2013, 2012 and 2011, respectively.

Depreciation expense was $213.6 million, $182.9 million and $125.0 million for the years ended December 31, 2013, 2012 and 2011, respectively. For the years ended December 31, 2013, 2012 and 2011, depreciation expense included $62.3 million, $55.5 million and $31.2 million, respectively, attributable to HEP operations.