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Revenue Recognition - Narrative (Details)	3 Months Ended
	Mar. 31, 2019 utlity_company Cogeneration_facilities
Revenue from Contract with Customer [Abstract]
Payment term (within)	30 days
Number of cogeneration facilities selling majority of electric output not used in operations | Cogeneration_facilities	3
Number of utility companies under long term contract to buy electrical output | utlity_company	2

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- Definition

Long-Term Contract For Selling Of Electric Power, Number Of Utility Companies Sold To

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- Definition

Number Of Cogeneration Facilities Selling Majority Of Electric Power Not Used In Operations

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- Definition

Revenue With Customers, Payment Term

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