CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Income Statement [Abstract]
Revenues	$ 1,364,028	$ 1,390,997	$ 1,416,722
Operating costs and expenses:
Direct costs	197,292	195,554	188,053
Sales and marketing	487,365	490,777	493,049
Research, development, and engineering	68,860	74,093	78,874
General, administrative, and other related costs	421,050	404,263	456,777
Goodwill impairment on business	56,850	27,369	32,629
Total operating costs and expenses	1,231,417	1,192,056	1,249,382
Income from operations	132,611	198,941	167,340
Interest expense, net	(20,031)	(33,842)	(72,023)
Gain (loss) on debt extinguishment, net	0	11,505	(5,274)
Loss on sale of businesses	0	0	(21,798)
Unrealized (loss) gain on short-term investments held at the reporting date, net	(28,495)	(7,145)	298,490
Gain (loss) on investments, net	357	(46,743)	(16,677)
Other (loss) income, net	(9,468)	8,437	1,293
Income from continuing operations before income tax (expense) benefit and changes from equity method investment	74,974	131,153	351,351
Income tax (expense) benefit	(24,142)	(57,957)	14,199
(Loss) income from equity method investment, net of income taxes	(9,329)	(7,730)	35,845
Net income from continuing operations	41,503	65,466	401,395
(Loss) income from discontinued operations, net of income taxes	0	(1,709)	95,319
Net income	$ 41,503	$ 63,757	$ 496,714
Net income per common share from continuing operations:
Basic (in dollars per share)	$ 0.89	$ 1.39	$ 8.74
Diluted (in dollars per share)	0.89	1.39	8.38
Net (loss) income per common share from discontinued operations:
Basic (in dollars per share)	0	(0.04)	2.08
Diluted (in dollars per share)	0	(0.04)	1.99
Net income per common share:
Basic (in dollars per share)	0.89	1.36	10.81
Diluted (in dollars per share)	$ 0.89	$ 1.36	$ 10.37
Weighted average shares outstanding:
Basic (in shares)	46,400,941	46,954,558	45,893,928
Diluted (in shares)	46,464,261	47,025,849	47,862,745