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Property, Plant and Equipment
12 Months Ended
Dec. 31, 2013
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,
2013
 
December 31,
2012
Land
$
72,484

 
$
53,491

Pipelines and related facilities
312,730

 
206,345

Storage and terminal facilities
281,819

 
268,738

Natural gas gathering and processing facilities
347,962

 
280,750

Linefill
14,701

 
13,158

Office and other property and equipment
65,679

 
47,679

Construction-in-progress
199,073

 
75,449

Property, plant and equipment, gross
1,294,448

 
945,610

Accumulated depreciation
(188,720
)
 
(130,886
)
Property, plant and equipment, net
$
1,105,728

 
$
814,724



We recorded depreciation expense of $60.4 million, $46.2 million and $45.9 million for the years ended December 31, 2013, 2012 and 2011, respectively.
We include within the cost of property, plant and equipment interest costs incurred while an asset is being constructed. We capitalized $4.3 million and $0.8 million of interest costs during the years ended December 31, 2013 and 2012, respectively.