Discontinued Operations (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 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	$ 54	$ 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		79		2,088
Cost of revenues		(2)		(101)
Gross profit		77		1,987
Total operating expenses		2		(1,817)
Gain on sale of Fly.com domain name		0		2,890
Income from discontinued operations before income taxes		79		3,060
Income tax expense		25		1,122
Income from discontinued operations, net of income taxes		$ 54		$ 1,938

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

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