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Discontinued Operations (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
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 $ 0
Income from discontinued operations, net of income taxes $ 0 $ 0 $ 54 $ 1,884 $ (63) $ 241 $ 222 $ 224 1,938 624 2,341
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 17,755
Cost of revenues                 (101) (458) (676)
Gross profit                 1,987 13,831 17,079
Total operating expenses                 (1,817) (12,949) (13,753)
Gain on sale of Fly.com domain name                 2,890 0 0
Income from discontinued operations before income taxes                 3,060 882 3,326
Income tax expense                 1,122 258 985
Income from discontinued operations, net of income taxes                 $ 1,938 $ 624 $ 2,341