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REVENUE (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017
Unbilled Receivables, Current | $ 52,000 |  | $ 52,000 |  | $ 138,500
Regulated Operating Revenue, Gas | 291,168 | $ 274,033 | 926,405 | $ 810,193 |
Regulated Operating Revenue, Other | 1,353 | 5,656 | 4,580 | 19,904 |
Regulated Operating Revenue | 292,521 | 279,689 | 930,985 | 830,097 |
Natural gas sales to customers [Member] |  |  |  |  |
Regulated Operating Revenue, Gas | 261,347 | 247,494 | 856,273 | 747,663 |
Transportation revenues [Member] |  |  |  |  |
Regulated Operating Revenue, Gas | 24,062 | 21,343 | 57,605 | 51,549 |
Miscellaneous revenues [Member] |  |  |  |  |
Regulated Operating Revenue, Gas | 5,759 | 5,196 | 12,527 | 10,981 |
Other revenues - natural gas sales related [Member] |  |  |  |  |
Other revenues - natural gas sales related | (1,108) | 3,377 | (78) | 15,540 |
Other revenues [Member] |  |  |  |  |
Regulated Operating Revenue, Other | $ 2,461 | $ 2,279 | $ 4,658 | $ 4,364 |

X
- Definition Miscellaneous revenues from contracts with customers from implied contracts established by our tariff rates approved by the regulatory authorities and includes miscellaneous service charges with the performance obligation satisfied at a point in time when services are rendered to the customer + References No definition available. + Details
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Namespace Prefix: | ogs_
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X
- Definition The total amount of regulated operating revenues recognized during the period. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
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Period Type: | duration

X
- Definition The amount of regulated gas operating revenues recognized during the period. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The amount of regulated other operating revenues recognized during the period. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
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X
- Definition Amount received for services rendered and products shipped, but not yet billed, for non-contractual agreements due within one year or the normal operating cycle, if longer. + References No definition available. + Details
Name: | us-gaap_UnbilledReceivablesCurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
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X
- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |

X
- Details
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Namespace Prefix: |
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Period Type: |

X
- Details
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Namespace Prefix: |
Data Type: | na
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Period Type: |

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- Details
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Namespace Prefix: |
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