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Property, Plant and Equipment - Narrative (Details) - Midstream Generator Assets - USD ($)	3 Months Ended	9 Months Ended
	Jun. 30, 2018	Sep. 30, 2018	Mar. 31, 2018
Property, Plant and Equipment
Assets held-for-sale			$ 5,700,000
Net realizable value of assets held for sale			$ 1,600,000
Impairment of assets to be disposed of		$ 4,100,000
Gain (loss) on sale of assets	$ 0

X

- Definition

Fair value portion of assets classified as held for sale.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
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Amount of assets held-for-sale that are not part of a disposal group, expected to be sold within a year or the normal operating cycle, if longer.

+ References

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Amount of gain (loss) from the difference between the sale price or salvage price and the book value of an asset that was sold or retired, and gain (loss) from the write down of assets from their carrying value to fair value.

+ References

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-Publisher FASB
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- Definition

The aggregate amount of write-downs for impairments recognized during the period for long-lived assets held for abandonment, exchange or sale.

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