Stock-Based Compensation Plans - Plan Administration (Details) - 2009 Equity Compensation Plan |
12 Months Ended |
---|---|
Dec. 31, 2020
shares
| |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |
Number of shares available for grant (in shares) | 247,000 |
Director | |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |
Share-based compensation plan maximum share grants per year (in shares) | 125,000 |
Share-based Payment Arrangement, Nonemployee | Director | |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |
Share-based compensation plan maximum share grants per year (in shares) | 20,000 |