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Quarterly Data (Unaudited) (Details) - $ / shares | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Condensed consolidated quarterly financial information [Abstract] |  |  |  |  |  |  |  |  |  |  |
Basic EPS - Net income (in dollars per share) | $ 0 | $ 0.63 | $ 0.65 | $ 0.21 | $ 0.50 | $ 0.46 | $ 0.64 | $ 0.36 | $ 1.49 | $ 1.95 | $ 3.51
Diluted EPS - Net income (in dollars per share) | 0 | 0.62 | 0.65 | 0.21 | 0.50 | 0.45 | 0.64 | 0.35 | 1.48 | 1.94 | 3.47
Dividends per share of common stock (in dollars per share) | 0.35 | 0.35 | 0.35 | 0.35 | 0.3125 | 0.3125 | 0.3125 | 0.3125 | $ 1.40 | $ 1.25 | $ 1.11
High common stock sales price (in dollars per share) | 83.34 | 74.82 | 65.56 | 70.84 | 61.25 | 58.36 | 52.23 | 48.89 |  |  |
Low common stock sales price (in dollars per share) | $ 69.63 | $ 59.58 | $ 53.26 | $ 43.70 | $ 55.17 | $ 50.27 | $ 46.82 | $ 42.17 |  |  |

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