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Equity Awards and Instruments - Stock Grants Narrative (Details) - Class B Common Stock - 2020 Incentive Award Plan - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fully vested shares granted (in shares)	21,956	0	0
Fully vested shares granted	$ 319

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