Discontinued Operations (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain on sale of Fly.com domain name			$ 0	$ 2,890
Income from discontinued operations, net of income taxes	$ 0	$ 0	$ 0	1,938
Discontinued Operations, Disposed of by Sale \| Fly.com domain
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Revenues from Search		0		2,088
Cost of revenues		0		(101)
Gross profit		0		1,987
Total operating expenses		0		(1,817)
Gain on sale of Fly.com domain name		0		2,890
Income from discontinued operations before income taxes		0		3,060
Income tax expense		0		1,122
Income from discontinued operations, net of income taxes		$ 0		$ 1,938

Amount before tax of gain (loss) not previously recognized resulting from the disposal of a discontinued operation.

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