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Stock-Based Employee Compensation Plans - Compensation expense expected to be recognized (Details)
$ in Thousands
Sep. 30, 2020
USD ($)
Share-based Compensation Arrangement by Share-based Payment Award  
Remainder of 2020 $ 216
2021 620
2022 392
2023 151
2024 and beyond 78
Estimated Stock Based Compensation Expense Total 1,457
Estimated Stock Based Compensation Expense Stock Options  
Share-based Compensation Arrangement by Share-based Payment Award  
Remainder of 2020 43
2021 123
2022 109
2023 101
2024 and beyond 67
Estimated Stock Based Compensation Expense Total 443
Estimated Stock Based Compensation Expense Restricted Stock  
Share-based Compensation Arrangement by Share-based Payment Award  
Remainder of 2020 112
2021 253
2022 119
2023 50
2024 and beyond 11
Estimated Stock Based Compensation Expense Total 545
Estimated Stock Based Compensation Expense Stock Units  
Share-based Compensation Arrangement by Share-based Payment Award  
Remainder of 2020 61
2021 244
2022 164
2023 0
2024 and beyond 0
Estimated Stock Based Compensation Expense Total $ 469