Discontinued Operations Gracenote Companies Statement of Operations (Details) - USD ($) $ in Thousands		3 Months Ended								12 Months Ended
		Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 29, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 28, 2014
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Income (Loss) from Discontinued Operations, net of taxes		$ (51,776)	$ (8,074)	$ (8,935)	$ (4,009)	$ 7,650	$ (5,978)	$ (6,061)	$ (192)	$ (72,794)	$ (4,581)	$ 44
Gracenote Companies | Discontinued Operations, Disposed of by Sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Operating revenues										225,903	209,964	168,734
Direct operating expenses										75,457	59,789	56,566
Selling, general and administrative										110,713	104,968	86,833
Depreciation										13,584	9,735	7,744
Amortization										29,999	28,826	21,233
Operating (loss) profit										(3,850)	6,646	(3,642)
Interest income										96	109	104
Interest expense (1)	[1]									(15,317)	(15,843)	(16,237)
Gain on investment transaction										0	0	700
Other non-operating gain, net										0	912	0
Income (loss) before income taxes										(19,071)	(8,176)	(19,075)
Income tax expense (benefit) (2)	[2]									53,723	(3,595)	(5,567)
Income (Loss) from Discontinued Operations, net of taxes										$ (72,794)	$ (4,581)	$ (13,508)

[1] The Company used $400 million of proceeds from the Gracenote Sale to pay down a portion of its outstanding borrowings under the Company’s Term Loan Facility (as defined and described in Note 9). Interest expense associated with the Company’s outstanding Term Loan Facility was allocated to discontinued operations based on the ratio of the $400 million prepayment to the total outstanding indebtedness under the Term Loan Facility in effect in each respective period.

[2] n the fourth quarter of 2016, as a result of meeting all criteria under ASC Topic 205 to classify Gracenote Companies as discontinued operations, the Company recorded tax expense of $62 million to increase the Company’s deferred tax liability for the outside basis difference related to the Gracenote Companies included in the Gracenote Sale. This charge was required to be recorded in the period the Company signed a definitive agreement to divest the business. Exclusive of this $62 million charge, the effective tax rates on pretax income from discontinued operations was 45.0%, 44.0%, and 29.2% for the years ended December 31, 2016, December 31, 2015, and December 28, 2014, respectively. These rates differ from the U.S. federal statutory rate of 35% primarily due to state income taxes (net of federal benefit), foreign tax rate differences, and the impact of certain nondeductible transaction costs and other adjustments.