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Discontinued Operations Gracenote Companies Statement of Operations Footnote (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Feb. 01, 2017
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Repayments of Long-term Debt       $ 589,661 $ 13,920
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent   35.00% 35.00% 35.00% 35.00%
Gracenote Companies | Discontinued Operations, Disposed of by Sale          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Effective Income Tax Rate Reconciliation, Discontinued Operations, Percent   39.20% 35.70% 47.80% 36.80%
Amended Secured Credit Facility | Term B Loans          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Repayments of Long-term Debt $ 400,000