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Income Taxes - Narrative (Details)	6 Months Ended
	Jun. 30, 2019
Income Tax Examination [Line Items]
Production tax credit (PTC), roll off period	10 years

X

- Definition

Deferred Tax Benefit, Production Tax Credit, Roll Off Period

+ References

No definition available.

+ Details

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X

- 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.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration