Discontinued Operations (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2018	Mar. 31, 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	1,884
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		2,009
Cost of revenues		(99)
Gross profit		1,910
Total operating expenses		(1,819)
Gain on sale of Fly.com domain name		2,890
Income from discontinued operations before income taxes		2,981
Income tax expense		1,097
Income from discontinued operations, net of income taxes		$ 1,884

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

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