Deferred Revenue from Membership Upgrade Sales and Deferred Commission Expense (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023
Movement in Deferred Revenue [Roll Forward]
Deferred revenue - upfront payments from membership upgrade sales, beginning	$ 218,337
Revenue recognized from membership upgrade sales upfront payments	(7,997)	$ (7,119)
Net increase in deferred revenue - upfront payments from membership grade sales	17,758	19,618
Deferred revenue - upfront payments from membership upgrade sales, ending (a)	228,099
Deferred Commissions Expense
Movement in Deferred Sales Inducements [Roll Forward]
Deferred commission expense, beginning	53,641	50,441
Deferred commission expense	3,479	3,723
Commission expense recognized	(2,238)	(2,186)
Net increase in deferred commission expense	1,241	1,537
Deferred commission expense, ending	54,882	51,978
Membership Subscription
Movement in Deferred Revenue [Roll Forward]
Deferred revenue - upfront payments from membership upgrade sales, beginning	206,625	185,660
Membership upgrade sales	16,328	17,253
Revenue recognized from membership upgrade sales upfront payments	(7,997)	(7,119)
Net increase in deferred revenue - upfront payments from membership grade sales	8,331	10,134
Deferred revenue - upfront payments from membership upgrade sales, ending (a)	$ 214,956	$ 195,794