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Other Intangibles (Notes) | 12 Months Ended
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Dec. 31, 2016
Other Intangible Assets Disclosure [Abstract] |
Intangible Assets Disclosure [Text Block] | Other Intangible Assets Our identifiable intangible assets are as follows (in thousands):
|  | Useful |  |  |  | Accumulated |  |
As of December 31, 2016 |  | Life |  | Gross |  | Amortization |  | Net
Intangible assets subject to amortization: |  |  |  |  |  |  |  |
Supply contract |  | 11.5 |  | $ | 12,227 |  |  | $ | (11,075 | ) |  | $ | 1,152 |
Intangible assets not subject to amortization: |  |  |  |  |  |  |  |
Rights-of-way assets |  | Indefinite |  | 13,268 |  |  |  |  | 13,268 |
Total |  |  |  | $ | 25,495 |  |  | $ | (11,075 | ) |  | $ | 14,420 |
|  | Useful |  |  |  | Accumulated |  |
As of December 31, 2015 |  | Life |  | Gross |  | Amortization |  | Net
Intangible assets subject to amortization: |  |  |  |  |  |  |  |
Supply contract |  | 11.5 |  | $ | 12,227 |  |  | $ | (10,012 | ) |  | $ | 2,215 |
Intangible assets not subject to amortization: |  |  |  |  |  |  |  |
Rights-of-way assets |  | Indefinite |  | 13,267 |  |  |  |  | 13,267 |
Total |  |  |  | $ | 25,494 |  |  | $ | (10,012 | ) |  | $ | 15,482 |
Amortization of intangible assets was $1.1 million during each of the years ended December 31, 2016, 2015 and 2014, and is included in depreciation and amortization on the accompanying consolidated statements of income and comprehensive income. Amortization expense is estimated to be $1.1 million for the year ended December 31, 2017. We expect to incur $0.1 million of amortization expense in 2018, at which point our supply contract will be fully amortized.

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- Definition Other Intangible Assets Disclosure [Abstract] + References No definition available. + Details
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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 1 -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16265-109275 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=26713463&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=26713463&loc=d3e16373-109275 + Details
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