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Properties, Plants and Equipment
12 Months Ended
Dec. 31, 2012
Property, Plant and Equipment [Abstract]  
Properties, Plants and Equipment
Properties, Plants and Equipment

 
 
December 31,
 
 
2012
 
2011
 
 
(In thousands)
Land, buildings and improvements
 
$
198,610

 
$
168,108

Refining facilities
 
2,261,733

 
2,106,900

Pipelines and terminals
 
1,113,080

 
922,866

Transportation vehicles
 
29,970

 
29,418

Other fixed assets
 
105,075

 
97,676

Construction in progress
 
234,646

 
306,819

 
 
3,943,114

 
3,631,787

Accumulated depreciation
 
(748,414
)
 
(578,882
)

 
$
3,194,700

 
$
3,052,905



We capitalized interest attributable to construction projects of $9.1 million, $17.2 million and $7.2 million for the years ended December 31, 2012, 2011 and 2010, respectively.

Depreciation expense was $182.9 million, $125.0 million and $94.0 million for the years ended December 31, 2012, 2011 and 2010, respectively. For the years ended December 31, 2012, 2011 and 2010, depreciation expense included $55.5 million, $31.2 million and $26.9 million, respectively, attributable to HEP operations.