Discontinued Operations - Income Statement Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Income tax expense	$ 2,900	$ 5,493
(Loss) income from discontinued operations, net of income tax	(42,704)	10,209
Separation costs	298	456
GoTo Business Division [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net revenues	58,215	166,905
Cost of net revenues	15,456	39,281
Gross margin	42,759	127,624
Research and development	9,108	21,727
Sales, marketing and services	20,881	58,821
General and administrative	7,636	12,960
Amortization of other intangible assets	1,176	3,674
Restructuring	3,189	509
Separation	40,573	14,231
Total operating expenses	82,563	111,922
(Loss) income from discontinued operations before income taxes	(39,804)	15,702
Income tax expense	2,900	5,493
(Loss) income from discontinued operations, net of income tax	$ (42,704)	$ 10,209