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Discontinued Operations (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
Discontinued Operations (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
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	$ 0
Income from discontinued operations, net of income taxes	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 54	$ 1,884	$ 0	1,938	624
Fly.com domain \| Discontinued Operations, Disposed of by Sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Revenues from Search										2,088	14,289
Cost of revenues										(101)	(458)
Gross profit										1,987	13,831
Total operating expenses										(1,817)	(12,949)
Gain on sale of Fly.com domain name										2,890	0
Income from discontinued operations before income taxes										3,060	882
Income tax expense										1,122	258
Income from discontinued operations, net of income taxes										$ 1,938	$ 624