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Other Intangibles (Notes) | 12 Months Ended
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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.

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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-Name Statement of Financial Accounting Standard (FAS) -Number 142 -Paragraph 44, 45, 46 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: 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=7658586&loc=d3e16323-109275 Reference 3: 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=7658586&loc=d3e16373-109275 Reference 4: 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=7658586&loc=d3e16265-109275 + Details
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