Discontinued Operations - Agreement (Details) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Nov. 17, 2016	Aug. 09, 2016
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Loss on sale	$ 0			$ (38,525)	$ 0	$ (38,525)
Discontinued Operations, Disposed of by Sale [Member] | E Commerce [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Consideration transferred	$ 1,000	$ 39,500			$ 1,000		$ 40,500
Loss on sale		$ (52,200)
Discontinued Operations, Disposed of by Sale [Member] | Search and Content [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Consideration transferred								$ 45,200
Loss on sale			$ (21,600)