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Equity Incentive Awards - Narratives (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award          
Compensation expense related to restricted stock and stock options     $ 10,481 $ 9,995 $ 9,352
Proceeds from stock options exercised     $ 100 $ 3,800 $ 4,900
Maximum          
Share-based Compensation Arrangement by Share-based Payment Award          
Vesting period (in years)     3 years 6 months    
Restricted Stock          
Share-based Compensation Arrangement by Share-based Payment Award          
Grants in period (in shares)     193,262 385,010 260,852
Share based compensation expense to be recognized     $ 11,100    
Period for recognition of cost not recognized (in years)     1 year 8 months 12 days    
2014 Awards          
Share-based Compensation Arrangement by Share-based Payment Award          
Options available for grant (in shares)     5,664,562    
Contractual term (in years)     10 years    
2014 Awards | Restricted Stock          
Share-based Compensation Arrangement by Share-based Payment Award          
Grants in period (in shares)   122,400      
Shares categorized as vesting (percent)   50.00%      
Share based compensation, fair market value   $ 3,200      
Shares categorized as performance based (percent)   50.00%      
Shares issued (shares) 70,862        
Fair value of shares issued $ 4,100        
Vesting period (in years)   3 years      
Award vesting rights (in percentage)     33.33%    
2014 Awards | Restricted Stock | Tranche One          
Share-based Compensation Arrangement by Share-based Payment Award          
Award vesting rights (in percentage)   33.33%      
2014 Awards | Restricted Stock | Tranche Two          
Share-based Compensation Arrangement by Share-based Payment Award          
Award vesting rights (in percentage)   33.33%      
2014 Awards | Restricted Stock | Tranche Three          
Share-based Compensation Arrangement by Share-based Payment Award          
Award vesting rights (in percentage)   33.33%      
2014 Awards | Performance Shares          
Share-based Compensation Arrangement by Share-based Payment Award          
Grants in period (in shares)     20,402    
Share based compensation, fair market value     $ 1,100