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Stock-Based Compensation (Narrative) (Details) - USD ($) shares in Millions, $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Stock options |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Shares reserved for future issuance (in shares) | 2.3 |
Time-vested restricted stock |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Vesting period (in years) for shares awarded | 3 years |
Performance-based shares |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Vesting period (in years) for shares awarded | 3 years |
Award vesting period | 3 years |
Level of performance achieved based on shares awarded, minimum | 0.00% |
Level of performance achieved based on shares awarded, maximum | 200.00% |
Time-vested restricted stock and deferred stock | Minimum |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Award vesting period | 3 years |
Time-vested restricted stock and deferred stock | Maximum |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Award vesting period | 5 years |
Restricted stock |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Unrecognized compensation cost | $ 62.0 |
Weighted average recognition period, in years | 2 years 3 months 18 days |
Aggregate market value of the shares released and issued on the vesting dates |  | $ 49.0

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