Condensed Consolidated Statements of Operations (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Income Statement [Abstract]
Revenues	$ 550,592	$ 362,980
Costs and expenses:
Operations and support	393,486	214,561
Sales and marketing	127,234	90,742
Technology (exclusive of amortization)	31,951	31,273
General and administrative	29,124	38,949
Depreciation and amortization	37,717	33,363
Total costs and expenses	619,512	408,888
Loss from operations	(68,920)	(45,908)
Interest expense, net	7,158	6,380
Loss before provision for income taxes	(76,078)	(52,288)
Income tax benefit	(617)	(18,861)
Net loss attributable to common stockholders	$ (75,461)	$ (33,427)
Net loss per share attributable to common stockholders
Basic	$ (0.81)	$ (0.36)
Diluted	$ (0.81)	$ (0.36)
Weighted-average shares used to compute net loss per share attributable to common stockholders:
Basic	93,215	91,793
Diluted	93,215	91,793