Consolidated Statements of Operations and Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Income Statement [Abstract]
Revenue	$ 272,194	$ 280,683
Cost of revenue	116,264	123,854
Gross profit	155,930	156,829
Operating expense:
Sales and marketing	67,191	66,588
Engineering and development	26,874	23,694
General and administrative	30,876	31,393
Total operating expense	124,941	121,675
Income from operations	30,989	35,154
Other income (expense):
Interest income	170	291
Interest expense	(32,734)	(37,214)
Total other expense—net	(32,564)	(36,923)
Loss before income taxes and equity earnings of unconsolidated entities	(1,575)	(1,769)
Income tax expense	669	1,719
Net loss	(2,244)	(3,488)
Comprehensive (loss) income:
Foreign currency translation adjustments	(557)	(401)
Unrealized (loss) gain on cash flow hedge, net of tax benefit (expense) of $304 and ($119) for the three months ended March 31, 2019 and 2020, respectively	372	(961)
Total comprehensive loss	$ (2,429)	$ (4,850)
Basic net loss per share (in usd per share)	$ (0.02)	$ (0.02)
Diluted net loss per share (in usd per share)	$ (0.02)	$ (0.02)
Weighted-average common shares used in computing net loss per share:
Basic (in shares)	146,027,241	143,512,293
Diluted (in shares)	146,027,241	143,512,293