Discontinued Operations Gracenote Companies Cash Flows (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017		Dec. 31, 2016	Jan. 31, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Stock-based compensation		$ 23,033	$ 32,933		$ 37,189
Depreciation (2)		54,206	56,314		72,409
Amortization (2)		166,715	166,679		196,663
Capital expenditures		76,188	66,832		99,659
Net proceeds from the sale of business (4)		0	554,487		0
Settlements of contingent consideration, net		0	0		(3,636)
Cash and cash equivalents classified as discontinued operations		0	0		12,751
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			1,992	[1]	4,196
Depreciation (2)			0	[1],[2]	13,584
Amortization (2)			0	[1],[2]	29,999
Capital expenditures		$ 0	1,578		23,548
Net proceeds from the sale of business (4)	[4]		554,487	[1],[3]	0
Settlements of contingent consideration, net	[4]		0	[1]	$ (3,636)
Proceeds from Divestiture of Businesses			584,000
Cash and cash equivalents classified as discontinued operations						$ 20,000
Disposal Groups, Including Discontinued Operations, Selling Costs			$ 9,000

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

[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] Net proceeds from the sale of business reflects the gross proceeds from the Gracenote sale of $584 million, net of $20 million of the Gracenote Companies’ cash, cash equivalents and restricted cash included in the sale and $9 million of selling costs.

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