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REVENUE (Tables) | 6 Months Ended
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Jun. 30, 2018
Revenues Disaggregated by Source [Table] | The following table sets forth our revenues disaggregated by source for the periods indicated:
|  | Three Months Ended |  | Six Months Ended
|  | June 30, |  | June 30,
|  | 2018 |  | 2017 |  | 2018 |  | 2017
|  | (Thousands of dollars)
Natural gas sales to customers |  | $ | 261,347 |  |  | $ | 247,494 |  |  | $ | 856,273 |  |  | $ | 747,663 |
Transportation revenues |  | 24,062 |  |  | 21,343 |  |  | 57,605 |  |  | 51,549 |
Miscellaneous revenues |  | 5,759 |  |  | 5,196 |  |  | 12,527 |  |  | 10,981 |
Total revenues from contracts with customers |  | 291,168 |  |  | 274,033 |  |  | 926,405 |  |  | 810,193 |
Other revenues - natural gas sales related |  | (1,108 | ) |  | 3,377 |  |  | (78 | ) |  | 15,540 |
Other revenues |  | 2,461 |  |  | 2,279 |  |  | 4,658 |  |  | 4,364 |
Total other revenues |  | 1,353 |  |  | 5,656 |  |  | 4,580 |  |  | 19,904 |
Total revenues |  | $ | 292,521 |  |  | $ | 279,689 |  |  | $ | 930,985 |  |  | $ | 830,097 |

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- Definition Tabular disclosure of entity-wide revenues from external customers for each product or service or each group of similar products or services if the information is not provided as part of the reportable operating segment information. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 40 -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e9031-108599 + Details
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Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration