Discontinued Operations Gracenote Companies Cash Flows (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]
Stock-based compensation		$ 5,000	$ 10,000	$ 27,432		$ 27,608
Depreciation (2)				41,761		53,567
Amortization (2)				125,001		148,195
Capital expenditures		13,324	26,424	41,423		61,855
Net proceeds from the sale of business (4)				557,793		0
Settlement of contingent consideration				0		(3,636)
Gracenote Companies | Discontinued Operations, Disposed of by Sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Stock-based compensation		0	1,000	2,000	[1]	3,000
Depreciation (2)	[2]			0	[1]	9,894
Amortization (2)	[2]			0	[1]	23,192
Capital expenditures		$ 0	$ 5,545	1,578	[1],[3]	16,514	[3]
Net proceeds from the sale of business (4)	[4]			557,793	[1]	0
Settlement of contingent consideration				$ 0		$ (3,636)

[1] (1) Results of operations for the Gracenote Companies are reflected through January 31, 2017, the date of the Gracenote Sale.

[2] (2)No depreciation expense or amortization expense was recorded by the Company in 2017 as the Gracenote Companies’ assets were held for sale as of December 31, 2016.

[3] (3)Non-cash investing and financing activities of Digital and Data businesses included in the Gracenote Sale were immaterial.

[4] (4)Net proceeds from the sale of business reflects the gross proceeds from the Gracenote sale of $584 million, net of $17 million of the Gracenote Companies’ cash and cash equivalents included in the sale and $9 million of selling costs.