Site Contingency, Loss Exposure, Number of Releases of Produced Water

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- Definition

Site Contingency, Loss Exposure, Release of Produced Water

+ References

No definition available.

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- Definition

Total costs accrued as of the balance sheet date for environmental loss contingencies.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=82911808&loc=d3e14326-108349

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 410
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- Definition

Reflects the estimated amount of loss from the specified contingency as of the balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 4
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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

Best estimate of the reasonably possible loss exposure in excess of the amount accrued for environmental loss contingencies at an individual site.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 410
-SubTopic 30
-Section 50
-Paragraph 10
-Subparagraph (d)(2)
-URI http://asc.fasb.org/extlink&oid=6393242&loc=d3e13237-110859

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Commitments and Contingencies Environmental Compliance (Details) $ in Millions	9 Months Ended	12 Months Ended
	Sep. 30, 2017 USD ($)	Dec. 31, 2014 Release	Dec. 31, 2016 USD ($) bbl	Sep. 15, 2015 USD ($)	May 06, 2015 bbl
Fort Berthold Indian Reservation
Site Contingency [Line Items]
Site Contingency, Loss Exposure, Number of Releases of Produced Water \| Release		3
Site Contingency, Loss Exposure, Release of Produced Water \| bbl			28,000		5,200
Accrual for Environmental Loss Contingencies	$ 2.7		$ 2.1
Maximum
Site Contingency [Line Items]
Loss Contingency, Estimate of Possible Loss				$ 1.1
Maximum \| Fort Berthold Indian Reservation
Site Contingency [Line Items]
Site Contingency, Loss Exposure in Excess of Accrual, Best Estimate	4.2
Minimum \| Fort Berthold Indian Reservation
Site Contingency [Line Items]
Site Contingency, Loss Exposure in Excess of Accrual, Best Estimate	$ 2.7