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Stock-Based Compensation - Narrative (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 6 Months Ended
Jan. 28, 2019
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Restricted Stock Units            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Performance-based restricted stock granted (in shares)       762,350    
Weighted average fair value per share (in dollars per share)   $ 7.43   $ 7.43   $ 8.83
Performance Stock Units            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Performance-based restricted stock granted (in shares)       669,550    
Threshold trading days       30 days    
Weighted average fair value per share (in dollars per share)   $ 10.52   $ 10.52   $ 13.75
2014 Plan | Restricted Stock Units            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Number of shares authorized to be issued under the plan (in shares)   6,400,000   6,400,000    
Unrecognized compensation expense related to unvested stock   $ 8.3   $ 8.3    
Weighted average remaining vesting period of unrecognized compensation expense       1 year 7 days    
Stock-based compensation expense   1.5 $ 1.8 $ 3.0 $ 3.6  
2014 Plan | Restricted Stock Units | Bold Contribution Agreement | Class A Common Stock            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Number of shares of common stock that each holder has contingent right to receive (in shares)       1    
2014 Plan | Performance Stock Units            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Stock-based compensation expense   $ 0.8 $ 0.3 $ 1.4 $ 0.4  
Performance-based restricted stock granted (in shares) 669,550          
Risk-free interest rate       2.60%    
Expected volatility, minimum       40.10%    
Expected volatility, maximum       114.10%    
Weighted average fair value per share (in dollars per share)   $ 9.30   $ 9.30    
Unrecognized compensation expense related to PSU awards   $ 7.3   $ 7.3    
Remaining vesting period of unrecognized compensation expense (in years)       1 year 2 months 16 days    
Minimum | Performance Stock Units            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Relative Total Shareholder Return, percentage 0.00%          
Maximum | Performance Stock Units            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Relative Total Shareholder Return, percentage 200.00%