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Other Intangible Assets (Tables) | 12 Months Ended
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Dec. 31, 2017
Other Intangible Assets Disclosure [Abstract] |
Schedule of Intangible Assets | Our identifiable intangible assets are as follows (in thousands):
|  | Useful |  |  |  | Accumulated |  |
As of December 31, 2017 |  | Life |  | Gross |  | Amortization |  | Net
Intangible assets subject to amortization: |  |  |  |  |  |  |  |
Supply contract |  | 11.5 |  | $ | 12,227 |  |  | $ | (12,138 | ) |  | $ | 89 |
Intangible assets not subject to amortization: |  |  |  |  |  |  |  |
Rights-of-way assets |  | Indefinite |  | 15,828 |  |  |  |  | 15,828 |
Total |  |  |  | $ | 28,055 |  |  | $ | (12,138 | ) |  | $ | 15,917 |
|  | 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 |

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- Definition Other Intangible Assets Disclosure [Abstract] + References No definition available. + Details
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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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Namespace Prefix: | dk_
Data Type: | nonnum:textBlockItemType
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