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Other Intangibles (Tables) | 12 Months Ended
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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 |

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- Definition Tabular disclosure of assets, excluding financial assets and goodwill, lacking physical substance by major class. + References No definition available. + Details
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