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Other Intangibles (Notes) | 12 Months Ended
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Dec. 31, 2013
Other 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, 2013 |  | Life |  | Gross |  | Amortization |  | Net
Intangible assets subject to amortization: |  |  |  |  |  |  |  |
Supply contracts |  | 11.5 |  | $ | 12,227 |  |  | $ | (7,885 | ) |  | $ | 4,342 |
Intangible assets not subject to amortization: |  |  |  |  |  |  |  |
Rights-of-way assets |  | Indefinite |  | 7,916 |  |  | — |  |  | 7,916 |
Total |  |  |  | $ | 20,143 |  |  | $ | (7,885 | ) |  | $ | 12,258 |
|  | Useful |  |  |  | Accumulated |  |
As of December 31, 2012 |  | Life |  | Gross |  | Amortization |  | Net
Intangible assets subject to amortization: |  |  |  |  |  |  |  |
Supply contracts |  | 11.5 |  | $ | 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 |
Amortization of intangible assets was $1.1 million, during each of the years ended December 31, 2013, 2012 and 2011 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 2014 through 2017.

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- Definition The entire disclosure for all or part of the information related to intangible assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16373-109275 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16265-109275 + Details
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