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Other Intangibles (Tables)
 12 Months Ended
Dec. 31, 2014
Other Intangible Assets Disclosure [Abstract]  
Schedule of Intangible Assets [Table Text Block]
 
 
Useful
 
 
 
Accumulated
 
 
As of December 31, 2014
 
Life
 
Gross
 
Amortization
 
Net
Intangible assets subject to amortization:
 
 
 
 
 
 
 
 
Supply contracts (Gross)
 
11.5
 
$
12,227

 
$
(8,949
)
 
$
3,278

Intangible assets not subject to amortization:
 
 
 
 
 
 
 
 
Rights-of-way assets
 
Indefinite
 
8,071

 
—

 
8,071

Total
 
 
 
$
20,298

 
$
(8,949
)
 
$
11,349


 
 
Useful
 
 
 
Accumulated
 
 
As of December 31, 2013
 
Life
 
Gross
 
Amortization
 
Net
Intangible assets subject to amortization:
 
 
 
 
 
 
 
 
Supply contracts (Gross)
 
11.5
 
$
12,227

 
$
(7,885
)
 
$
4,342

Intangible assets not subject to amortization:
 
 
 
 
 
 
 
 
Rights-of-way assets
 
Indefinite
 
8,032

 
—

 
8,032

Total
 
 
 
$
20,259


$
(7,885
)
 
$
12,374