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Stock-Based Compensation - Narrative (Details) - USD ($)
3 Months Ended
Feb. 28, 2018
May 09, 2017
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Unrecognized compensation expense related to PSU awards     $ 3,400,000      
Restricted Stock Units            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Performance-based restricted stock granted (in shares)     258,500 48,000    
PSUs outstanding (in shares)     1,083,710 518,625 969,245 781,500
Weighted average fair value per share (in dollars per share)     $ 9.56 $ 12.72 $ 9.89 $ 12.53
Performance Stock Units            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Threshold trading days     30 days      
Remaining vesting period of unrecognized compensation expense (in years)     1 year 5 months 23 days      
2014 Plan | Restricted Stock Units            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Unrecognized compensation expense related to unvested stock     $ 8,700,000      
Weighted average remaining vesting period of unrecognized compensation expense     1 year 10 days      
Stock-based compensation expense     $ 1,800,000 $ 1,300,000    
2014 Plan | Restricted Stock Units | Bold Contribution Agreement            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Number of shares authorized to be issued under the plan   5,800,000        
2014 Plan | Restricted Stock Units | Bold Contribution Agreement | Class A Common Stock            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Increase in number of shares authorized to be issued under the plan   4,300,000        
Number of shares of common stock that each holder has contingent right to receive   1        
2014 Plan | Performance Stock Units            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Stock-based compensation expense     $ 100,000 $ 0    
Performance-based restricted stock granted (in shares) 252,500          
PSUs outstanding (in shares)     252,500   0  
Weighted average fair value per share (in dollars per share)     $ 13.75      
Minimum | Performance Stock Units            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Relative Total Shareholder Return, percentage 0.00%          
Minimum | Performance Stock Units | Class A Common Stock            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Potential shares issuable under grant 0          
Maximum | Performance Stock Units            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Relative Total Shareholder Return, percentage 200.00%          
Maximum | Performance Stock Units | Class A Common Stock            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Potential shares issuable under grant 505,000