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Discontinued Operations (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 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  
Income from discontinued operations, net of income taxes $ 54 $ 222 1,938 $ 446
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 4,247 2,088 8,222
Cost of revenues (2) (140) (101) (298)
Gross profit 77 4,107 1,987 7,924
Total operating expenses 2 (3,768) (1,817) (7,283)
Gain on sale of Fly.com domain name 0 0 2,890 0
Income from discontinued operations before income taxes 79 339 3,060 641
Income tax expense 25 117 1,122 195
Income from discontinued operations, net of income taxes $ 54 $ 222 $ 1,938 $ 446