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Equity Incentive Plans - Narrative (Details)
$ / shares in Units, $ in Millions
3 Months Ended 9 Months Ended
Apr. 24, 2018
$ / shares
shares
Sep. 30, 2018
USD ($)
shares
Sep. 30, 2018
USD ($)
metric
shares
Sep. 30, 2017
USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Options granted (in shares)     475,000  
Restricted Stock        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Expected volatility rate     44.50%  
Risk free interest rate     2.58%  
Share based compensation expense | $     $ 15.6 $ 13.8
Unrecognized compensation costs related to non vested stock option awards | $   $ 40.0 $ 40.0  
Expected weighted average period to recognize expense     2 years 5 months  
Granted shares     905,000  
Number of annual performance metrics | metric     2  
Beta     1.05  
Restricted Stock | Minimum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period     3 years  
Award vesting rights, percentage     0.00%  
Restricted Stock | Maximum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period     4 years  
Award vesting rights, percentage     200.00%  
Employee Stock        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Discount on purchase of Common Stock for employee from the current market price     5.00%  
Maximum shares authorized under ESPP for sale offer to eligible employees (in shares)   750,000 750,000  
Shares issued (in shares)   17,751    
Stock Options        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Expected volatility rate     39.69%  
Expected term     5 years  
Risk free interest rate     2.84%  
Expected dividend yield     8.70%  
Options granted (in shares) 475,000      
Grant date fair value (in dollars per share) | $ / shares $ 3.64      
Share based compensation expense | $     $ 0.7 $ 1.1
Unrecognized compensation costs related to non vested stock option awards | $   $ 2.4 $ 2.4  
Expected weighted average period to recognize expense     3 years  
2018 Stock Incentive Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares available for issuance 4,600,000      
Certain Employees and Executive Officers | Restricted Stock        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Granted shares     905,000  
Certain Employees and Executive Officers | Performance Shares        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Granted shares     352,500  
Performance metric one | Restricted Stock        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period     3 years  
Award vesting rights, percentage     50.00%  
Award performance period     3 years  
Performance metric two | Restricted Stock        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award vesting rights, percentage     50.00%  
Award performance period     3 years