Quarterly report pursuant to Section 13 or 15(d)

Share-Based Payments - Narrative (Details)

v3.21.4
Share-Based Payments - Narrative (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended
Dec. 31, 2021
Jun. 30, 2021
Dec. 31, 2020
Nov. 30, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total stock-based compensation cost $ 3,709   $ 3,246  
Restricted Stock        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Granted (in shares) 636,800      
Percent of shares vested on time 42.00%      
Unrecognized compensation cost on non-vested awards $ 30,245      
Weighted average period of recognition of unrecognized compensation cost on non-vested awards 2 years 8 months 12 days      
Restricted stock awards unvested (in shares) 74,639      
Restricted Stock | Minimum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Expiration period 3 years      
Restricted Stock | Maximum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Expiration period 5 years      
Restricted Stock | Tranche One        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting increment 50.00%      
Restricted Stock | Tranche Two        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting increment 25.00%      
Restricted Stock | Tranche Three        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting increment 25.00%      
Stock Options        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Expiration period 5 years      
Award vesting period 3 years      
Stock Options | Tranche One        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting increment 33.33%      
Stock Options | Tranche Two        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting increment 33.33%      
Stock Options | Tranche Three        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting increment 33.33%      
2017 Equity Incentive Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares reserved for future issuance under award plan (in shares)       3,450,000
Shares issuance under award plan (in shares) 211,788      
Options granted (in shares) 75,000 75,000    
Share-based awards outstanding (in shares) 1,479,325      
Share price of options granted (in dollars per share)   $ 41.70    
2017 Equity Incentive Plan | Stock Compensation Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Term of plan 10 years      
Maximum number of shares available for grants or awards (in shares) 1,700,000      
2017 Equity Incentive Plan | Time-Based Restricted Share Units        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Granted (in shares) 768,498      
2017 Equity Incentive Plan | Performance-Based Restricted Share Units        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Granted (in shares) 933,212      
Retirement Eligible Employees        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Future income tax benefit from compensation expense recognized $ 409   $ 239  
Director Fee Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares deferred under stock based compensation plan (in shares) 38,832      
Value of annual stock based grant $ 140      
Total restricted stock awards granted to date (in shares) 265,225      
Restricted stock awards unvested (in shares) 91,996      
2014 Director Fee Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Annual retainer fee paid to non-employee directors $ 90      
Annual retainer fee paid to non-employee Chairman of the Board $ 210      
2019 Director Fee Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Maximum number of shares available for grants or awards (in shares) 150,000