Discontinued Operations - Financial Statement Information (Details) - USD ($) $ in Thousands			12 Months Ended
	Jan. 01, 2019	Jan. 31, 2017	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Income tax expense					$ 2,900
Loss from discontinued operations, net of income tax			$ 0	$ 0	(42,704)
Separation costs					500
Spinoff transaction		$ 461,800			461,831
Transfer of cash			0	0	28,523
Cumulative-effect adjustment from adoption of accounting standards	$ 800		838	132,778	388
GoTo Business Division
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net revenues					58,215
Cost of net revenues					15,456
Gross margin					42,759
Research and development					9,108
Sales, marketing and services					20,881
General and administrative					7,636
Amortization of other intangible assets					1,176
Restructuring					3,189
Separation					40,573
Total operating expenses					82,563
Loss from discontinued operations before income taxes					(39,804)
Income tax expense					2,900
Loss from discontinued operations, net of income tax					(42,704)
Retained Earnings
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Spinoff transaction		$ 475,200			475,231
Cumulative-effect adjustment from adoption of accounting standards			$ 838	$ 132,778	(5,303)
Foreign currency | GoTo Business Division
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Distribution of the GoTo Business					$ 13,400