Condensed Consolidated Statements of Operations - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Total revenues		$ 341,873	$ 355,144	$ 994,297	$ 1,008,094
Cost of revenues	[1]	52,603	49,698	144,707	142,335
Gross profit		289,270	305,446	849,590	865,759
Operating expenses:
Sales and marketing	[1]	119,474	126,577	361,013	354,949
Research, development and engineering	[1]	17,735	19,619	55,883	56,999
General and administrative	[1]	95,658	114,240	299,842	339,236
Goodwill impairment on business		27,369	0	27,369	32,629
Total operating expenses		260,236	260,436	744,107	783,813
Income from operations		29,034	45,010	105,483	81,946
Interest expense, net		(8,560)	(14,490)	(28,419)	(56,980)
Gain on debt extinguishment, net		10,112	0	11,505	0
Loss on sale of businesses, net		0	(24,600)	0	(21,798)
Unrealized gain (loss) on short-term investments held at the reporting date, net		4,201	0	(14,165)	0
Gain (loss) on investments, net		471	0	(47,772)	(16,677)
Other income (loss), net		4,218	107	12,962	(466)
Income (loss) from continuing operations before income taxes and (loss) income from equity method investment, net		39,476	6,027	39,594	(13,975)
Income tax (expense) benefit		(18,100)	2,665	(33,231)	19,883
(Loss) income from equity method investment, net		(3,191)	(1,923)	(10,077)	16,596
Net income (loss) from continuing operations		18,185	6,769	(3,714)	22,504
Income from discontinued operations, net of income taxes		0	35,800	0	113,705
Net income (loss)		$ 18,185	$ 42,569	$ (3,714)	$ 136,209
Net income (loss) per common share from continuing operations:
Basic (in dollars per share)		$ 0.39	$ 0.14	$ (0.08)	$ 0.50
Diluted (in dollars per share)		0.39	0.14	(0.08)	0.47
Net income per common share from discontinued operations:
Basic (in dollars per share)		0	0.77	0	2.51
Diluted (in dollars per share)		0	0.74	0	2.39
Numerator for basic and diluted net income per common share:
Basic (in dollars per share)		0.39	0.91	(0.08)	3.01
Diluted (in dollars per share)		$ 0.39	$ 0.88	$ (0.08)	$ 2.86
Weighted average shares outstanding:
Basic (in shares)		46,871,897	46,738,073	46,967,671	45,258,819
Diluted (in shares)		46,871,897	48,582,585	46,967,671	47,565,062
Share-based compensation expense		$ 6,386	$ 6,403	$ 20,806	$ 18,002
Cost of revenues
Weighted average shares outstanding:
Share-based compensation expense		63	70	289	220
Sales and marketing
Weighted average shares outstanding:
Share-based compensation expense		772	335	2,447	879
Research, development and engineering
Weighted average shares outstanding:
Share-based compensation expense		567	514	2,048	1,390
General and administrative
Weighted average shares outstanding:
Share-based compensation expense		$ 4,984	$ 5,484	$ 16,022	$ 15,513

[1] (1) Includes share-based compensation expense as follows: Cost of revenues$142 $67 $226 $150 Sales and marketing1,106 278 1,675 544 Research, development and engineering852 458 1,481 876 General and administrative5,603 5,066 11,038 10,029 Total$7,703 $5,869 $14,420 $11,599