Condensed Consolidated Statements of Operations - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Total revenues	$ 398,185	$ 332,393
Cost of revenues	57,822	59,131
Gross profit	340,363	273,262
Operating expenses:
Sales and marketing	121,186	99,438
Research, development and engineering	21,351	15,406
General and administrative	119,346	103,171
Total operating expenses	261,883	218,015
Income from operations	78,480	55,247
Interest expense, net	21,704	20,971
Gain on sale of businesses	(1,979)	0
Loss on investments, net	0	20,832
Other (income) expense, net	(622)	6,876
Income before income taxes and (income) loss from equity method investment, net	59,377	6,568
Income tax expense	5,725	8,703
(Income) loss from equity method investment, net	(24,270)	4,269
Net Income (Loss) Attributable to Parent, Total	$ 77,922	$ (6,404)
Net income (loss) per common share:
Basic (in usd per share)	$ 1.75	$ (0.13)
Diluted (in usd per share)	$ 1.67	$ (0.13)
Weighted average shares outstanding:
Basic (in shares)	44,399,149	47,620,774
Diluted (in shares)	46,731,872	47,620,774
Share-based compensation expense	$ 6,113	$ 6,313
Cost of revenues
Weighted average shares outstanding:
Share-based compensation expense	132	134
Sales and marketing
Weighted average shares outstanding:
Share-based compensation expense	362	398
Research, development and engineering
Weighted average shares outstanding:
Share-based compensation expense	520	431
General and administrative
Weighted average shares outstanding:
Share-based compensation expense	$ 5,099	$ 5,350