Condensed Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands		3 Months Ended				6 Months Ended
		Jun. 30, 2020		Jun. 30, 2019		Jun. 30, 2020	Jun. 30, 2019
Revenue:
Revenue		$ 768,352		$ 599,578		$ 1,894,173	$ 1,053,682
Cost of revenue (exclusive of amortization)
Cost of revenue		461,071	[1]	271,221	[1]	1,222,743	422,569
Sales and marketing		155,598		187,433		360,246	349,020
Technology and development		128,857		120,330		263,775	228,100
General and administrative		85,511		82,839		177,796	178,613
Impairment costs		0		0		76,800	0
Integration costs		0		293		0	645
Total costs and expenses		831,037		662,116		2,101,360	1,178,947
Loss from operations		(62,685)		(62,538)		(207,187)	(125,265)
Gain on partial extinguishment of 2021 Notes		6,391		0		6,391	0
Other income		10,115		9,458		19,708	18,626
Interest expense		(37,590)		(18,897)		(75,182)	(35,363)
Loss before income taxes		(83,769)		(71,977)		(256,270)	(142,002)
Income tax benefit (expense)		(679)		0		8,549	2,500
Net loss		$ (84,448)		$ (71,977)		$ (247,721)	$ (139,502)
Net loss per share - basic and diluted (usd per share)		$ (0.38)		$ (0.35)		$ (1.15)	$ (0.68)
Weighted-average shares outstanding - basic and diluted (in shares)		219,467		205,754		215,070	205,137
Amortization of website development costs and intangible assets included in technology and development		$ 13,100		$ 11,000		$ 24,900	$ 22,000
Technology and Development
Cost of revenue (exclusive of amortization)
Amortization of website development costs and intangible assets included in technology and development	[1]	18,857		14,656		36,041	29,056
Homes
Revenue:
Revenue		454,252		248,924		1,224,125	377,396
Cost of revenue (exclusive of amortization)
Cost of revenue		431,788	[1]	240,732	[1]	1,163,987	363,151
Sales and marketing		47,877		37,409		119,466	58,271
Technology and development		28,918		18,198		61,456	30,479
General and administrative		21,902		17,808		45,323	32,165
Impairment costs						0	0
Integration costs		0		0		0	0
Total costs and expenses		530,485		314,147		1,390,232	484,066
Loss from operations		(76,233)		(65,223)		(166,107)	(106,670)
Other income		0		0		0	0
Interest expense		(3,825)		(5,899)		(11,909)	(9,657)
Loss before income taxes		(80,058)		(71,122)		(178,016)	(116,327)
IMT
Revenue:
Revenue		280,339		323,669		611,005	621,941
Cost of revenue (exclusive of amortization)
Cost of revenue		23,387	[1]	26,059	[1]	47,705	50,310
Sales and marketing		96,026		135,440		216,199	262,094
Technology and development		93,176		94,261		188,204	182,230
General and administrative		53,884		54,671		112,638	125,521
Impairment costs						73,900	0
Integration costs		0		0		0	0
Total costs and expenses		266,473		310,431		638,646	620,155
Loss from operations		13,866		13,238		(27,641)	1,786
Other income		5,300		0		5,300	0
Interest expense		0		0		0	0
Loss before income taxes		19,166		13,238		(22,341)	1,786
Mortgages Segment
Revenue:
Revenue		33,761		26,985		59,043	54,345
Cost of revenue (exclusive of amortization)
Cost of revenue		5,896	[1]	4,430	[1]	11,051	9,108
Sales and marketing		11,695		14,584		24,581	28,655
Technology and development		6,763		7,871		14,115	15,391
General and administrative		9,725		10,360		19,835	20,927
Impairment costs						2,900	0
Integration costs		0		293		0	645
Total costs and expenses		34,079		37,538		72,482	74,726
Loss from operations		(318)		(10,553)		(13,439)	(20,381)
Other income		385		402		587	715
Interest expense		(307)		(287)		(533)	(388)
Loss before income taxes		$ (240)		$ (10,438)		$ (13,385)	$ (20,054)

[1] Amortization of website development costs and intangible assets included in technology and development of $18,857 and $14,656 for the three months ended June 30, 2020 and 2019, respectively and $36,041 and $29,056 for the six months ended June 30, 2020 and 2019, respectively.