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Stock-Based Compensation Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
May 05, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based Compensation $ 6,000 $ 5,000 $ 16,104 $ 27,432  
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) 2,564,359   2,564,359    
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) 168,049   168,049    
[1] (1) Results of operations for the Gracenote Companies are reflected through January 31, 2017, the date of the Gracenote Sale.