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Fair Value Measurements (Details) $ in Thousands	Sep. 30, 2021 USD ($) numberOfFinancialInstitutions	Dec. 31, 2020 USD ($) numberOfFinancialInstitutions
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Highview Investment	$ 552	$ 552
Recurring Basis
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Number of instruments held | numberOfFinancialInstitutions	0	0
Carrying Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Highview Investment	$ 552	$ 552
Highview Obligation	226	228
Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Highview Investment	552	552
Highview Obligation	$ 226	$ 228

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The number of derivative instruments of a particular group held by the entity.

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Amount of investment in equity security without readily determinable fair value.

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-Publisher FASB
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