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Stock-Based Compensation - Narrative (Details)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2019
USD ($)
shares
Mar. 31, 2019
shares
Jun. 30, 2018
USD ($)
Jun. 30, 2019
USD ($)
compensation_plan
shares
Jun. 30, 2018
USD ($)
Dec. 31, 2018
shares
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]            
Number of stock-based compensation plans | compensation_plan       2    
Shares available for grant (in shares) 2,400,000     2,400,000    
Compensation expense | $ $ 1.7   $ 0.9 $ 3.0 $ 2.8  
Nonvested awards compensation costs not yet recognized | $ $ 9.7     $ 9.7    
Nonvested awards, compensation costs not yet recognized, period for recognition       1 year 8 months 12 days    
Common stock, shares issued (shares) 23,611,403     23,611,403   23,186,258
Equity Option [Member]            
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]            
Performance Period       3 years    
Delayed vesting period from grant date       1 year    
Restricted Stock [Member]            
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]            
Grants other than options (shares) 183,403     516,955    
Restricted Stock Units (RSUs) [Member]            
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]            
Performance Period       1 year    
Grants other than options (shares) 74,188     108,188    
Performance-Based Restricted Stock Units [Member]            
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]            
Performance Period       2 years    
Grants other than options (shares)       19,377    
Target percent for PBU's used to calculate stock compensation expense (percent)       100.00%    
Performance Shares [Member]            
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]            
Common stock, shares issued (shares) 203,524     203,524    
Awards Vesting over 2 Years [Member] | Restricted Stock [Member]            
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]            
Performance Period       2 years    
Grants other than options (shares) 104,856          
Awards Vesting over 1 Year [Member] | Restricted Stock [Member]            
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]            
Performance Period   1 year   1 year    
Grants other than options (shares) 18,547 203,116        
Awards Vesting over 3 Years [Member] | Restricted Stock [Member]            
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]            
Performance Period   3 years   3 years    
Grants other than options (shares) 60,000 130,436