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Equity Incentive Plan - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Allocated share-based compensation expense $ 1.3 $ 1.4
Stock Options    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Expected future stock-based compensation expense $ 1.1  
Average period of expected future stock option expense 11 months 27 days  
Restricted Stock    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Expected future stock-based compensation expense $ 1.7  
Average period of expected future stock option expense 1 year 11 days