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Subsequent Events (Details) - Subsequent Event - NW Stack - Drilling Rights $ in Millions	Jul. 27, 2017 USD ($)
Subsequent Event
Percent of costs to be funded	10.00%
Allocated working interest per well	20.00%
Private Investment Fund
Subsequent Event
Drilling participation agreement	$ 200.0
Percent of costs to be funded	90.00%
Costs to be funded	$ 100.0
Allocated working interest per well	80.00%
Additional funding option	$ 100.0

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- Definition

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- Definition

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- Definition

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- Definition

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- Definition

Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

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