Schedule I: Condensed Financial Information of Registrant - CONDENSED BALANCE SHEETS (Narrative) (Details) - $ / shares	Dec. 31, 2021	Dec. 31, 2020
Class A Common Stock
Segment Reporting Information [Line Items]
Common stock, par value (in dollars per share)	$ 0.0001	$ 0.0001
Common stock, shares authorized (in shares)	200,000,000	200,000,000
Common stock, shares outstanding (in shares)	40,088,000	35,657,000
Common stock, shares issued (in shares)	40,088,000	35,657,000
Class B Common Stock
Segment Reporting Information [Line Items]
Common stock, par value (in dollars per share)	$ 0.0001	$ 0.0001
Common stock, shares authorized (in shares)	50,000,000	50,000,000
Common stock, shares outstanding (in shares)	10,691,000	14,040,000
Common stock, shares issued (in shares)	10,691,000	14,040,000
Parent Company | Class A Common Stock
Segment Reporting Information [Line Items]
Common stock, par value (in dollars per share)	$ 0.0001
Common stock, shares authorized (in shares)	200,000,000	200,000,000
Common stock, shares outstanding (in shares)	40,088,000	35,657,000
Common stock, shares issued (in shares)	40,088,000	35,657,000
Parent Company | Class B Common Stock
Segment Reporting Information [Line Items]
Common stock, par value (in dollars per share)	$ 0.0001	$ 0.0001
Common stock, shares authorized (in shares)	50,000,000	50,000,000
Common stock, shares outstanding (in shares)	10,691,000	14,040,000
Common stock, shares issued (in shares)	10,691,000	14,040,000