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Commitments and Contingencies - Additional Information (Details) - USD ($)	Aug. 19, 2019	Jun. 30, 2020	Mar. 06, 2020	Dec. 31, 2019
Loss Contingencies [Line Items]
Regulatory liabilities		$ 49,629,000		$ 51,715,000
Boyds Fire [Member] | Damage from Fire [Member] | Maximum [Member]
Loss Contingencies [Line Items]
Loss contingency, damages sought, value	$ 4,400,000
Provision for Rate Refunds [Member]
Loss Contingencies [Line Items]
Regulatory liabilities		$ 7,339,000	$ 8,500,000	$ 3,565,000
Provision for Rate Refunds [Member] | Electricity [Member]
Loss Contingencies [Line Items]
Regulatory liabilities			4,900,000
Provision for Rate Refunds [Member] | Natural Gas [Member]
Loss Contingencies [Line Items]
Regulatory liabilities			$ 3,600,000

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The value (monetary amount) of the award the plaintiff seeks in the legal matter.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 9
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The amount for the individual regulatory current liability as itemized in a table of regulatory current liabilities as of the end of the period.

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-Name Accounting Standards Codification
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-SubTopic 405
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