CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Income Statement [Abstract]
Revenue from Contract with Customer, Excluding Assessed Tax	$ 89,407	$ 111,803	$ 202,438	$ 215,782
Revenue Not from Contract with Customer, Other	9,702	0	9,702	0
Revenue	99,109	111,803	212,140	215,782
Cost of revenue	37,582	41,563	80,105	80,764
Gross profit	61,527	70,240	132,035	135,018
Operating expenses:
General and administrative	31,099	30,587	62,980	58,194
Sales and marketing	10,521	12,795	23,967	25,235
Credit loss expense	6,166	5,379	12,186	10,527
Research and development	2,699	3,532	6,267	6,865
Other charges	5,003	2,234	7,087	5,304
Total operating expenses	55,488	54,527	112,487	106,125
Income from operations	6,039	15,713	19,548	28,893
Other expense:
Interest expense	(1,702)	(2,538)	(3,809)	(5,020)
Loss on equity method investments	0	(154)	0	(186)
Other non-operating income/(expense), net	(1,400)	86	(469)	(968)
Total other expense, net	(3,102)	(2,606)	(4,278)	(6,174)
Income before income taxes	2,937	13,107	15,270	22,719
(Provision for)/benefit from income taxes	(656)	(4,807)	(5,880)	(2,734)
Net income	$ 2,281	$ 8,300	$ 9,390	$ 19,985
Net income per common share:
Basic (in dollars per share)	$ 0.07	$ 0.25	$ 0.27	$ 0.59
Diluted (in dollars per share)	$ 0.06	$ 0.23	$ 0.26	$ 0.55
Weighted average number of common shares outstanding:
Basic (in shares)	34,290	33,825	34,238	33,806
Dilutive common stock equivalents (in shares)	2,319	2,493	2,431	2,638
Diluted (in shares)	36,609	36,318	36,669	36,444