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Equity Awards and Instruments - Stock Grants Narrative (Details) - Class B Common Stock - 2020 Incentive Award Plan - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fully vested shares granted (in shares)	0	10,951
Fully vested shares granted		$ 119

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