Annual report pursuant to Section 13 and 15(d)

Stock-Based Compensation Plans - Share-based Compensation Related to Restricted Stock Awards (Details)

v3.20.4
Stock-Based Compensation Plans - Share-based Compensation Related to Restricted Stock Awards (Details) - Restricted Stock - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock-based compensation expense $ 2,858 $ 3,264 $ 2,885
Employee      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock-based compensation expense 2,223 2,667 2,332
Non-employee Directors      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock-based compensation expense $ 635 $ 597 $ 553