Discontinued Operations Gracenote Companies Balance Sheet (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Total current assets of discontinued operations	$ 0	$ 62,605
Total non-current assets of discontinued operations	0	608,153
Total current liabilities of discontinued operations	0	54,284
Total non-current liabilities discontinued operations	0	95,314
Gracenote Companies | Discontinued Operations, Disposed of by Sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Cash and cash equivalents	17,000	12,751
Accounts receivable, net		38,727
Prepaid expenses and other		11,127
Total current assets of discontinued operations		62,605
Property, plant and equipment, net		49,348
Goodwill		333,258
Other intangible assets, net		219,287
Other long-term assets		6,260
Total non-current assets of discontinued operations		608,153
Total Assets Classified as Discontinued Operations in the Unaudited Condensed Consolidated Balance Sheets	$ 0	670,758
Accounts payable		6,237
Employee compensation and benefits		17,011
Deferred revenue		27,113
Accrued expenses and other current liabilities		3,923
Total current liabilities of discontinued operations		54,284
Deferred income taxes		89,029
Postretirement, medical, life and other benefits		2,786
Other obligations		3,499
Total non-current liabilities discontinued operations		95,314
Total Liabilities Classified as Discontinued Operations in the Unaudited Condensed Consolidated Balance Sheets		149,598
Net Assets Classified as Discontinued Operations		$ 521,160