CONSOLIDATED AND COMBINED FINANCIAL STATEMENT DETAILS (Tables)

12 Months Ended

Dec. 31, 2018

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Schedule of Other Current Assets

	December 31,
	2018		2017
	(In thousands)
Other current assets:
Capitalized sales commissions	$	35,482	$	—
Proceeds receivable from the sale of a business	24,250		—
Prepaid expenses	16,218		10,937
Other	8,983		1,835
Other current assets	$	84,933	$	12,772

Schedule of Property and Equipment, Net

Property and equipment, including significant improvements, are recorded at cost. Repairs and maintenance costs are expensed as incurred. Depreciation is computed using the straight-line method over the estimated useful lives of the assets, or, in the case of leasehold improvements, the lease term, if shorter.

Asset Category	Estimated Useful Lives
Computer equipment and capitalized software	2 to 3 Years
Furniture and other equipment	5 to 7 Years
Buildings and leasehold improvements	5 to 25 Years

	December 31,
	2018			2017
	(In thousands)
Property and equipment, net of accumulated depreciation and amortization:
Computer equipment and capitalized software	$	59,521		$	41,853
Buildings and leasehold improvements	16,340			13,984
Furniture and other equipment	5,860			6,222
Projects in progress	25,611			12,801
Land	—			2,800
Property and equipment	107,332			77,660
Accumulated depreciation and amortization	(36,473		)	(24,368		)
Property and equipment, net of accumulated depreciation and amortization	$	70,859		$	53,292

Schedule of Accrued Expenses and Other Current Liabilities

	December 31,
	2018		2017
	(In thousands)
Accrued expenses and other current liabilities:
Accrued employee compensation and benefits	$	24,977	$	30,354
Accrued advertising expense	20,216		17,243
Other	60,794		27,574
Accrued expenses and other current liabilities	$	105,987	$	75,171

Schedule of Other Income (Expense), Net

	Years Ended December 31,
	2018		2017		2016
	(In thousands)
Other income (expense), net	$	17,859	$	1,974	$	(699	)