Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Accounts receivable allowance	$ 7,296	$ 7,051
Deferred financing costs	$ 9,081	$ 2,369
Common shares authorized (in shares)	400,000,000
Class A common stock
Common par value (in dollars per share)	$ 0.01	$ 0.01
Common shares authorized (in shares)	300,000,000	300,000,000
Common shares issued (in shares)	12,440,045	14,436,065
Common shares outstanding (in shares)	12,440,045	14,436,065
Class B common stock
Common par value (in dollars per share)	$ 0.01	$ 0.01
Common shares authorized (in shares)	50,000,000	50,000,000
Common shares issued (in shares)	815,296	2,966,669
Common shares outstanding (in shares)	815,296	2,966,669
Class C common stock
Common par value (in dollars per share)	$ 0.01	$ 0.01
Common shares authorized (in shares)	50,000,000	50,000,000
Common shares issued (in shares)	3,461,341	1,636,341
Common shares outstanding (in shares)	3,461,341	1,636,341