Condensed Consolidated Statements of Operations - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Total revenues	$ 444,252	$ 356,976	$ 1,271,480	$ 1,020,353
Cost of revenues	64,302	55,822	185,462	171,755
Gross profit	379,950	301,154	1,086,018	848,598
Operating expenses:
Sales and marketing	139,693	95,074	394,981	287,317
Research, development and engineering	21,639	14,261	62,634	43,273
General and administrative	122,477	114,381	359,498	312,283
Goodwill impairment on business	0	0	32,629	0
Total operating expenses	283,809	223,716	849,742	642,873
Income from operations	96,141	77,438	236,276	205,725
Interest expense, net	(19,862)	(22,712)	(62,832)	(65,879)
(Loss) gain on sale of businesses	(24,600)	17,122	(21,798)	17,122
Loss on investments, net	0	(156)	(16,677)	(20,991)
Other income, net	1,660	14,230	1,367	16,413
Income before income taxes and (loss) income from equity method investment, net	53,339	85,922	136,336	152,390
Income tax expense	8,847	24,330	16,723	49,011
(Loss) income from equity method investment, net	(1,923)	(709)	16,596	(10,799)
Net income	$ 42,569	$ 60,883	$ 136,209	$ 92,580
Net income per common share:
Basic (in usd per share)	$ 0.91	$ 1.31	$ 3.01	$ 1.96
Diluted (in usd per share)	$ 0.88	$ 1.31	$ 2.86	$ 1.93
Weighted average shares outstanding:
Basic (in shares)	46,738,073	46,279,515	45,258,819	46,914,750
Diluted (in shares)	48,582,585	46,309,072	47,565,062	47,620,308
Share-based compensation expense	$ 6,755	$ 5,800	$ 19,119	$ 18,643
Cost of revenues
Weighted average shares outstanding:
Share-based compensation expense	108	136	357	413
Sales and marketing
Weighted average shares outstanding:
Share-based compensation expense	427	321	1,160	1,135
Research, development and engineering
Weighted average shares outstanding:
Share-based compensation expense	613	425	1,690	1,340
General and administrative
Weighted average shares outstanding:
Share-based compensation expense	$ 5,607	$ 4,918	$ 15,912	$ 15,755