Net Income (Loss) Per Common Share - Narrative (Details) - USD ($)	3 Months Ended	9 Months Ended
Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities (in share)	1,099,800	0	0	0
Net income (loss) attributable to noncontrolling interest	$ 8,420,000	$ (6,413,000)	$ (3,263,000)	$ (5,977,000)
Class B Common Stock
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Common stock, par value (in dollars per share)	$ 0.001		$ 0.001		$ 0.001
Net income (loss) attributable to noncontrolling interest	$ 8,400,000	$ (6,400,000)	$ (3,300,000)	(6,000,000)
Dilutive securities, effect on earnings per share			$ 0	$ 0

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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