Condensed Consolidated Statements of Operations - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Total revenues		$ 337,356	$ 341,293	$ 652,424	$ 652,950
Cost of revenues	[1]	46,004	48,785	92,104	92,637
Gross profit		291,352	292,508	560,320	560,313
Operating expenses:
Sales and marketing	[1]	123,777	120,421	241,539	228,372
Research, development and engineering	[1]	19,721	17,705	38,148	37,380
General and administrative	[1]	101,967	111,698	204,184	224,996
Goodwill impairment on business		0	32,629	0	32,629
Total operating expenses		245,465	282,453	483,871	523,377
Income from operations		45,887	10,055	76,449	36,936
Interest expense, net		(6,956)	(21,013)	(18,466)	(42,490)
Gain on sale of businesses		0	823	0	2,802
Unrealized loss on short-term investments		(27,317)	0	(18,366)	0
Loss on investments, net		(48,243)	(16,677)	(48,243)	(16,677)
Other income (loss), net		6,345	(816)	8,744	(573)
(Loss) income from continuing operations before income taxes and (loss) income from equity method investment, net		(30,284)	(27,628)	118	(20,002)
Income tax expense (benefit)		10,051	(10,334)	15,131	(17,218)
(Loss) income from equity method investment, net		(6,101)	(5,751)	(6,886)	18,519
Net (loss) income from continuing operations		(46,436)	(23,045)	(21,899)	15,735
Income from discontinued operations, net of income taxes		0	38,762	0	77,905
Net (loss) income		$ (46,436)	$ 15,717	$ (21,899)	$ 93,640
Net (loss) income per common share from continuing operations:
Basic (in dollars per share)		$ (0.99)	$ (0.52)	$ (0.47)	$ 0.35
Diluted (in dollars per share)		(0.99)	(0.52)	(0.47)	0.33
Net income per common share from discontinued operations:
Basic (in dollars per share)		0	0.87	0	1.75
Diluted (in dollars per share)		0	0.87	0	1.65
Earnings Per Share, Basic [Abstract]
Basic (in usd per share)		(0.99)	0.35	(0.47)	2.10
Diluted (in usd per share)		$ (0.99)	$ 0.35	$ (0.47)	$ 1.98
Weighted average shares outstanding:
Basic (in shares)		46,978,709	44,613,533	47,016,351	44,506,933
Diluted (in shares)		46,978,709	44,613,533	47,016,351	47,130,979
Share-based compensation expense		$ 7,703	$ 5,869	$ 14,420	$ 11,599
Cost of revenues
Weighted average shares outstanding:
Share-based compensation expense		142	67	226	150
Sales and marketing
Weighted average shares outstanding:
Share-based compensation expense		1,106	278	1,675	544
Research, development and engineering
Weighted average shares outstanding:
Share-based compensation expense		852	458	1,481	876
General and administrative
Weighted average shares outstanding:
Share-based compensation expense		$ 5,603	$ 5,066	$ 11,038	$ 10,029

[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