Quarterly report pursuant to Section 13 or 15(d)

Stock-Based Compensation - Narrative (Details)

v3.10.0.1
Stock-Based Compensation - Narrative (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 9 Months Ended
Mar. 26, 2018
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Apr. 27, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Stock-based compensation expense   $ 2.1 $ 0.2 $ 5.4 $ 0.2  
Employer matching contributions (less than $0.1 million for the three months ended 9/30/2017)   0.1 $ 0.1 0.2 $ 0.1  
Restricted Stock            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Compensation not yet recognized   0.9   $ 0.9    
Period for recognition of compensation not yet recognized       9 months 4 days    
Awards granted (shares)       156,653    
Awards granted (USD per share)       $ 7.57    
Restricted Stock Units            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Compensation not yet recognized   4.6   $ 4.6    
Period for recognition of compensation not yet recognized       1 year 11 months 9 days    
Awards granted (shares)       523,350    
Awards granted (USD per share)       $ 6.67    
Market Based Performance Restricted Stock Units            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Compensation not yet recognized   2.1   $ 2.1    
Period for recognition of compensation not yet recognized       2 years 3 months    
Awards granted (shares) 432,973     432,973    
Awards granted (USD per share) $ 8.99     $ 8.99    
Cash-Settled Restricted Stock Units            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Compensation not yet recognized   0.4   $ 0.4    
Period for recognition of compensation not yet recognized       2 years 5 months 27 days    
Awards granted (shares)       98,743    
Awards granted (USD per share)       $ 6.62    
Liability for cash-settled restricted stock units   $ 0.1   $ 0.1    
Closing price (USD per share)       $ 6.10    
Long-Term Incentive Plan | Class A Common Stock            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Stock issuance authorized (shares)           7,500,000
Stock available for grant (shares)   5,784,873   5,784,873    
Tranche One            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Employer matching contribution (as a percent)       100.00%    
Employer matching contribution in relation to gross pay (as a percent)       3.00%    
Tranche Two            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Employer matching contribution (as a percent)       50.00%    
Tranche Two | Minimum            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Employer matching contribution in relation to gross pay (as a percent)       3.00%    
Tranche Two | Maximum            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Employer matching contribution in relation to gross pay (as a percent)       5.00%