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Equity Incentive Plans - Narrative (Details)
$ in Millions
12 Months Ended
Dec. 31, 2019
USD ($)
metric
shares
Dec. 31, 2018
metric
shares
Dec. 31, 2017
metric
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period (in years) 4 years    
Expiration period 10 years    
Options granted (in shares) 391,000 500,000 500,000
Options outstanding, number outstanding (in shares) 1,590,000    
Restricted Stock Award      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Unrecognized compensation costs related to awards | $ $ 27.2    
Expected weighted average period to recognize expense 2 years 1 month 6 days    
Performance measurement | metric 2 2 2
Granted (in shares) 788,000    
Restricted Stock Award | Minimum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period (in years) 3 years    
Award vesting rights (as percent) 0.00% 0.00% 0.00%
Restricted Stock Award | Maximum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period (in years) 4 years    
Award vesting rights (as percent) 200.00% 200.00% 200.00%
Restricted Stock Award | Certain Employees and Executive Officers      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Granted (in shares) 788,000 906,000 933,000
Stock Options      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Unrecognized compensation costs related to awards | $ $ 2.2    
Expected weighted average period to recognize expense 2 years 6 months    
Performance Shares | Certain Employees and Executive Officers      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Granted (in shares) 250,000 352,500 352,500
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%    
Capital shares reserved for future issuance 750,000    
Issuance of common stock (ESPP) (in shares) 30,153 24,365 20,009
2014 Stock Incentive Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares authorized 4,600,000    
Tranche One | Restricted Stock Award      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award vesting rights (as percent) 50.00% 50.00% 50.00%
Performance period 3 years    
Tranche Two | Restricted Stock Award      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award vesting rights (as percent) 50.00% 50.00% 50.00%