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Discontinued Operations (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Gain on sale of Fly.com domain name     $ 2,890 $ 0
Income from discontinued operations, net of income taxes $ 0 $ 241 1,938 687
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 3,617 2,088 11,839
Cost of revenues 0 (91) (101) (389)
Gross profit 0 3,526 1,987 11,450
Total operating expenses 0 (3,196) (1,817) (10,479)
Gain on sale of Fly.com domain name 0 0 2,890 0
Income from discontinued operations before income taxes 0 330 3,060 971
Income tax expense 0 89 1,122 284
Income from discontinued operations, net of income taxes $ 0 $ 241 $ 1,938 $ 687