Deferred Revenue from Membership Upgrade Sales and Deferred Commission Expense (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 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	(3,947)	$ (3,505)
Net increase in deferred revenue - upfront payments from membership grade sales	9,080	10,074
Deferred revenue - upfront payments from membership upgrade sales, ending (a)	223,470
Deferred Commissions Expense
Movement in Deferred Sales Inducements [Roll Forward]
Deferred commission expense, beginning	53,641	50,441
Deferred commission expense	1,491	1,744
Commission expense recognized	(1,108)	(1,095)
Net increase in deferred commission expense	383	649
Deferred commission expense, ending	54,024	51,090
Membership Subscription
Movement in Deferred Revenue [Roll Forward]
Deferred revenue - upfront payments from membership upgrade sales, beginning	206,625	185,660
Membership upgrade sales	7,543	7,975
Revenue recognized from membership upgrade sales upfront payments	(3,947)	(3,505)
Net increase in deferred revenue - upfront payments from membership grade sales	3,596	4,470
Deferred revenue - upfront payments from membership upgrade sales, ending (a)	$ 210,221	$ 190,130