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Compensation Plans (Restricted Stock Units) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Compensation expense recognized | $ 6.1 | $ 6.3 | $ 5.8
Restricted Stock Units (RSUs) [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Restricted stock units issued | 95,000 | 68,000 | 172,000
Vesting period of compensation expense not yet recognized | 2 years 3 months 18 days |  |
Unrecognized compensation expense | $ 7.0 |  |
Restricted Stock Units (RSUs) [Member] | 2020 Grants [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Compensation expense recognized | 1.1 |  |
Unrecognized compensation expense | $ 5.7 |  |
Restricted Stock Units (RSUs) [Member] | 2020 Grants [Member] | Minimum [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting period of compensation expense not yet recognized | 24 months |  |
Restricted Stock Units (RSUs) [Member] | 2020 Grants [Member] | Maximum [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting period of compensation expense not yet recognized | 26 months |  |
Restricted Stock Units (RSUs) [Member] | 2019 Grants [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Compensation expense recognized |  | $ 1.0 |
Unrecognized compensation expense |  | $ 3.7 |
Restricted Stock Units (RSUs) [Member] | 2019 Grants [Member] | Minimum [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting period of compensation expense not yet recognized |  | 24 months |
Restricted Stock Units (RSUs) [Member] | 2019 Grants [Member] | Maximum [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting period of compensation expense not yet recognized |  | 26 months |
Restricted Stock Units (RSUs) [Member] | 2018 Grants [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Compensation expense recognized |  |  | $ 2.2
Unrecognized compensation expense |  |  | $ 8.1
Restricted Stock Units (RSUs) [Member] | 2018 Grants [Member] | Minimum [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting period of compensation expense not yet recognized |  |  | 24 months
Restricted Stock Units (RSUs) [Member] | 2018 Grants [Member] | Maximum [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting period of compensation expense not yet recognized |  |  | 26 months

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