Discontinued Operations Gracenote Companies Balance Sheet (Details) - USD ($) $ in Thousands		Dec. 31, 2016	Dec. 31, 2015	Dec. 28, 2014
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Cash and cash equivalents		$ 12,751	$ 14,824	$ 0
Total current assets held for sale		62,605	72,698
Total current liabilities held for sale		54,284	59,962
Total non-current liabilities held for sale		95,314	99,623
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		12,751	14,824
Accounts receivable, net		38,727	49,751
Prepaid expenses and other		11,127	8,123
Total current assets held for sale		62,605	72,698
Property, plant and equipment, net		49,348	42,287
Goodwill		333,258	333,588
Other intangible assets, net		219,287	250,197
Other long-term assets		6,260	6,370
Total non-current assets held for sale (1)	[1]	608,153	632,442
Total Assets Classified as Held For Sale in the Consolidated Balance Sheets		670,758	705,140
Accounts payable		6,237	6,522
Employee compensation and benefits		17,011	14,973
Deferred revenue		27,113	29,972
Accrued expenses and other current liabilities		3,923	8,495
Total current liabilities held for sale		54,284	59,962
Deferred income taxes		89,029	93,326
Postretirement, medical, life and other benefits		2,786	2,842
Other obligations		3,499	3,455
Total non-current liabilities held for sale		95,314	99,623
Total Liabilities Classified as Held For Sale in the Consolidated Balance Sheets		149,598	159,585
Net Assets Classified as Held for Sale		$ 521,160	$ 545,555

[1] Excludes $17 million and $206 million as of December 31, 2016 and December 31, 2015, respectively related to real estate assets held for sale. See Note 6 for further details.