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Earnings Per Common Share (Narrative) (Details) - shares | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Mar. 31, 2020 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] |  |  |  |  |  |  |
Treasury Stock, Shares, Acquired |  | 76,000 | 84,603 | 250,000 | 86,650 |  |
Stock Issued During Period, Shares, Acquisitions |  |  |  | 1,037,205 |  |  | 1,037,205
Common Stock [Member] |  |  |  |  |  |  |
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] |  |  |  |  |  |  |
Treasury Stock, Shares, Acquired | 0 |  | 84,603 |  |  | 76,000 | 421,253
Performance Shares [Member] | Common Stock [Member] |  |  |  |  |  |  |
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period | 0 |  | 0 |  |  | 62,265 | 58,740
Restricted Stock Units (RSUs) [Member] | Common Stock [Member] |  |  |  |  |  |  |
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period |  |  |  |  |  |  | 15,700

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