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Stock-Based Compensation Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
May 05, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation $ 5,114 $ 14,963  
Gracenote Companies | Discontinued Operations, Disposed of by Sale      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation $ 0 $ 1,992 [1]  
2016 Incentive Compensation Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of shares authorized for issuance under Equity Incentive Plan (shares)     5,100,000
Number of shares available for grant under Equity Incentive Plan (shares) 2,545,525    
2016 Directors Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of shares authorized for issuance under Equity Incentive Plan (shares)     200,000
Number of shares available for grant under Equity Incentive Plan (shares) 168,382    
[1] (1) Results of operations for the Gracenote Companies are reflected through January 31, 2017, the date of the Gracenote Sale.