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Property, Plant and Equipment, Net Property, Plant and Equipment (Notes)
12 Months Ended
Dec. 31, 2014
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment Disclosure [Text Block]
10. Property, Plant and Equipment, Net
Property, plant and equipment, net was as follows:
 
December 31, 2014
 
December 31, 2013
 
(In thousands)
Buildings and improvements
$
31,444

 
$
28,241

Pipelines and related assets
77,445

 
71,103

Terminals and related assets
109,286

 
103,361

Asphalt plant, terminals and related assets
23,007

 
22,714

Wholesale and related assets
30,065

 
24,592

 
271,247

 
250,011

Accumulated depreciation
(99,651
)
 
(84,297
)
 
171,596

 
165,714

Construction in progress
10,949

 
13,051

Property, plant and equipment, net
$
182,545

 
$
178,765


Depreciation expense was $16.8 million, $15.4 million and $13.8 million for the years ended December 31, 2014, 2013 and 2012, respectively.