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Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2016
Accounting Policies [Abstract]  
Property, Plant and Equipment [Table Text Block]
Depreciation is computed using the straight-line method over management’s estimated useful lives of the related assets, except for automotive equipment, which is depreciated using a declining-balance method. The estimated useful lives are as follows:

 
Years
Buildings and building improvements
15-40
Pipelines, tanks and terminals
15-40
Asset retirement obligation assets
15-50
Other equipment
3-15
Property, plant and equipment, at cost, consist of the following (in thousands):

 
 
December 31,
 
 
2016
 
2015
 
 
 
 
 
Land and land improvements
 
$
4,435

 
$
4,253

Building and building improvements
 
2,236

 
1,886

Pipelines, tanks and terminals
 
305,302

 
299,101

Asset retirement obligation assets
 
2,073

 
2,073

Other equipment
 
12,925

 
4,270

Construction in process
 
15,436

 
14,064

 
 
342,407

 
325,647

Less: accumulated depreciation
 
(91,378
)
 
(71,799
)
 
 
$
251,029

 
$
253,848


Property, plant and equipment, accumulated depreciation and depreciation expense by reporting segment as of and for the years ended December 31, 2016 and 2015 are as follows (in thousands):

 
 
As of and For the Year Ended December 31, 2016
 
 
Pipelines and Transportation
 
Wholesale Marketing and Terminalling
 
Consolidated
Property, plant and equipment
 
$
279,155

 
$
63,252

 
$
342,407

Less: accumulated depreciation
 
(67,032
)
 
(24,346
)
 
(91,378
)
Property, plant and equipment, net
 
$
212,123

 
$
38,906

 
$
251,029

Depreciation expense
 
$
16,133

 
$
3,617

 
$
19,750

    
 
 
As of and For the Year Ended December 31, 2015
 
 
Pipelines and Transportation
 
Wholesale Marketing and Terminalling
 
Consolidated
Property, plant and equipment
 
$
266,169

 
$
59,478

 
$
325,647

Less: Accumulated depreciation
 
(50,542
)
 
(21,257
)
 
(71,799
)
Property, plant and equipment, net
 
$
215,627

 
$
38,221

 
$
253,848

Depreciation expense
 
$
15,011

 
$
3,618

 
$
18,629
Schedule of Change in Asset Retirement Obligation [Table Text Block]
The reconciliation of the beginning and ending carrying amounts of asset retirement obligations as of December 31, 2016 and 2015 is as follows (in thousands):

 
 
December 31,
 
 
2016
 
2015
Beginning balance
 
$
3,506

 
$
3,319

Liabilities settled
 
—

 
(64
)
Accretion expense
 
266

 
251

Ending balance
 
$
3,772

 
$
3,506