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Stock-Based Compensation - Narrative (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 06, 2018
Feb. 28, 2018
May 09, 2017
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Dec. 31, 2016
Restricted Stock Units                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Performance-based restricted stock granted (in shares)           344,000 214,500    
PSUs outstanding (in shares)       815,069 492,371 815,069 492,371 969,245 781,500
Weighted average fair value per share (in dollars per share)       $ 9.59 $ 12.42 $ 9.59 $ 12.42 $ 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 4 months 10 days      
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 6,400,000                
Stock-based compensation expense       $ 1,800,000 $ 1,600,000 $ 3,600,000 $ 3,000,000    
Unrecognized compensation expense related to unvested stock       7,500,000   $ 7,500,000      
Weighted average remaining vesting period of unrecognized compensation expense           1 year 8 days      
2014 Plan | Restricted Stock Units | 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 600,000                
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       $ 300,000 $ 0 $ 400,000 $ 0    
Performance-based restricted stock granted (in shares)   252,500              
PSUs outstanding (in shares)       252,500   252,500   0  
Unrecognized compensation expense related to PSU awards       $ 3,100,000   $ 3,100,000      
Weighted average fair value per share (in dollars per share)       $ 13.75   $ 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