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

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- Definition Deferred Tax Benefit, Production Tax Credit, Roll Off Period + References No definition available. + Details
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Balance Type: | na
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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. + Details
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Namespace Prefix: | us-gaap_
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Period Type: | duration