CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME (LOSS) - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Statement [Abstract]
Revenue	$ 909,990	$ 1,106,603	$ 764,865
Costs and expenses:
Cost of revenue (exclusive of depreciation and amortization shown separately below)	54,494	68,379	36,399
Selling and marketing expense	617,404	735,180	500,291
General and administrative expense	129,101	116,847	101,219
Product development	43,636	39,953	26,958
Depreciation	14,201	10,998	7,385
Amortization of intangibles	53,078	55,241	23,468
Change in fair value of contingent consideration	5,327	28,402	10,788
Severance	295	1,026	2,352
Litigation settlements and contingencies	(943)	(151)	(186)
Total costs and expenses	916,593	1,055,875	708,674
Operating (loss) income	(6,603)	50,728	56,191
Other (expense) income, net:
Interest expense, net	(36,300)	(20,271)	(12,437)
Other income (expense)	376	524	(10)
(Loss) income before income taxes	(42,527)	30,981	43,744
Income tax benefit	19,961	8,479	65,575
Net (loss) income from continuing operations	(22,566)	39,460	109,319
Loss from discontinued operations, net of tax	(25,689)	(21,632)	(12,820)
Net (loss) income and comprehensive (loss) income	$ (48,255)	$ 17,828	$ 96,499
Weighted average shares outstanding:
Basic (in shares)	13,007	12,834	12,504
Diluted (in shares)	13,007	14,619	14,097
(Loss) income per share from continuing operations:
Basic (in dollars per share)	$ (1.73)	$ 3.07	$ 8.74
Diluted (in dollars per share)	(1.73)	2.70	7.75
Loss per share from discontinued operations:
Basic (in dollars per share)	(1.98)	(1.69)	(1.03)
Diluted (in dollars per share)	(1.98)	(1.48)	(0.91)
Net (loss) income per share:
Basic (in dollars per share)	(3.71)	1.39	7.72
Diluted (in dollars per share)	$ (3.71)	$ 1.22	$ 6.85