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Other Intangibles (Notes)
 12 Months Ended
Dec. 31, 2012
Goodwill and Intangible Assets Disclosure [Abstract]  
Intangible Assets Disclosure [Text Block]
Other Intangible Assets

Our identifiable intangible assets are are as follows (in thousands):
 

Useful
 

 
Accumulated
 
 
As of December 31, 2012
 
Life
 
Gross
 
Amortization
 
Net
Intangible assets subject to amortization:
 
 
 
 
 
 
 
 
Supply contracts
 
11.5 years
 
$
12,227

 
$
(6,822
)
 
$
5,405

Intangible assets not subject to amortization:
 
 
 
 
 
 
 
 
Rights-of-way assets
 
Indefinite
 
7,025

 
—

 
7,025

Total
 
 
 
$
19,252

 
$
(6,822
)
 
$
12,430


 

Useful
 

 
Accumulated
 
 
As of December 31, 2011
 
Life
 
Gross
 
Amortization
 
Net
Intangible assets subject to amortization:
 
 
 
 
 
 
 
 
Supply contracts
 
11.5 years
 
$
12,227

 
$
(5,759
)
 
$
6,468

Intangible assets not subject to amortization:
 
 
 
 
 
 
 
 
Rights-of-way assets
 
Indefinite
 
3,557

 
—

 
3,557

Total
 
 
 
$
15,784


$
(5,759
)
 
$
10,025



Amortization of intangible assets was $1.1 million, $1.1 million and $1.0 million during the years ended December 31, 2012, 2011 and 2010 and is included in depreciation and amortization on the accompanying consolidated statements of operations. Amortization expense is estimated to be $1.1 million per year for the years ended 2013 through 2017.