Deferred Revenue from Membership Upgrade Sales and Deferred Commission Expense (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2024	Sep. 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	(12,170)	$ (10,863)
Net increase in deferred revenue - upfront payments from membership grade sales	26,697	29,140
Deferred revenue - upfront payments from membership upgrade sales, ending (a)	232,862
Deferred Commissions Expense
Movement in Deferred Sales Inducements [Roll Forward]
Deferred commission expense, beginning	53,641	50,441
Deferred commission expense	5,806	5,850
Commission expense recognized	(3,397)	(3,122)
Net increase in deferred commission expense	2,409	2,728
Deferred commission expense, ending	56,050	53,169
Membership Subscription
Movement in Deferred Revenue [Roll Forward]
Deferred revenue - upfront payments from membership upgrade sales, beginning	206,625	185,660
Membership upgrade sales	26,404	28,041
Revenue recognized from membership upgrade sales upfront payments	(12,170)	(10,863)
Net increase in deferred revenue - upfront payments from membership grade sales	14,234	17,178
Deferred revenue - upfront payments from membership upgrade sales, ending (a)	$ 220,859	$ 202,838