CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Income Statement [Abstract]
Revenue	$ 113,031	$ 103,979
Cost of revenue	42,523	39,201
Gross profit	70,508	64,778
Operating expenses:
General and administrative	31,881	27,607
Sales and marketing	13,446	12,440
Credit loss expense	6,020	5,148
Research and development	3,568	3,333
Other charges	2,084	3,070
Total operating expenses	56,999	51,598
Income from operations	13,509	13,180
Other expense:
Interest expense	(2,107)	(2,482)
Loss on equity method investments	0	(32)
Other non-operating income/(expense), net	931	(1,054)
Total other expense, net	(1,176)	(3,568)
Income before income taxes	12,333	9,612
(Provision for)/benefit from income taxes	(5,224)	2,073
Net income	$ 7,109	$ 11,685
Net income per common share:
Basic (in dollars per share)	$ 0.21	$ 0.35
Diluted (in dollars per share)	$ 0.19	$ 0.32
Weighted average number of common shares outstanding:
Basic (in shares)	34,186	33,654
Dilutive common stock equivalents (in shares)	2,403	2,752
Diluted (in shares)	36,589	36,406