Discontinued Operations Gracenote Companies Cash Flows (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2017		Mar. 31, 2016
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Stock-based compensation		$ 14,963		$ 8,493
Depreciation (2)				17,338
Amortization (2)				49,378
Capital expenditures		14,634		17,848
Net proceeds from the sale of business (4)		554,725		0
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]	989
Depreciation (2)	[2]	0	[1]	2,896
Amortization (2)	[2]	0	[1]	7,713
Capital expenditures	[3]	1,578	[1]	4,923
Net proceeds from the sale of business (4)	[4]	$ 554,725	[1]	$ 0

[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 $581 million, net of $17 million of the Gracenote Companies’ cash and cash equivalents included in the sale and $9 million of selling costs.