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Shareholders' Equity and Common Stock Equivalents - Stock Option Information by Ranges of Exercise Prices (Details) - $ / shares | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Summary of options outstanding segregated by ranges of exercise prices |  |  |
Total Outstanding Options, Options (in shares) | 908,557 | 774,821 | 719,015
Total Outstanding Options, Weighted Average Option Price per Share (in usd per share) | $ 37.82 | $ 36.65 |
Total Outstanding Options, Weighted Average Remaining Term | 7 years 5 months 9 days |  |
Vested and Exercisable Options (in shares) | 368,700 | 271,116 |
Vested and Exercisable Options, Weighted Average Option Price per Share (in usd per share) | $ 34.81 | $ 31.42 | $ 27.12
Vested and Exercisable Options, Weighted Average Remaining Term | 6 years 1 month 9 days |  |
Minimum |  |  |
Summary of options outstanding segregated by ranges of exercise prices |  |  |
Total Outstanding Options, Weighted Average Option Price per Share (in usd per share) | $ 42.95 |  |
Maximum |  |  |
Summary of options outstanding segregated by ranges of exercise prices |  |  |
Total Outstanding Options, Weighted Average Option Price per Share (in usd per share) | $ 44.75 |  |
Range One |  |  |
Summary of options outstanding segregated by ranges of exercise prices |  |  |
Total Outstanding Options, Options (in shares) | 11,100 |  |
Total Outstanding Options, Weighted Average Option Price per Share (in usd per share) | $ 22.34 |  |
Total Outstanding Options, Weighted Average Remaining Term | 4 months 9 days |  |
Vested and Exercisable Options (in shares) | 11,100 |  |
Vested and Exercisable Options, Weighted Average Option Price per Share (in usd per share) | $ 22.34 |  |
Vested and Exercisable Options, Weighted Average Remaining Term | 4 months 9 days |  |
Range One | Minimum |  |  |
Summary of options outstanding segregated by ranges of exercise prices |  |  |
Total Outstanding Options, Weighted Average Option Price per Share (in usd per share) | $ 20.60 |  |
Range One | Maximum |  |  |
Summary of options outstanding segregated by ranges of exercise prices |  |  |
Total Outstanding Options, Weighted Average Option Price per Share (in usd per share) | $ 22.69 |  |
Range Two |  |  |
Summary of options outstanding segregated by ranges of exercise prices |  |  |
Total Outstanding Options, Options (in shares) | 271,579 |  |
Total Outstanding Options, Weighted Average Option Price per Share (in usd per share) | $ 30.94 |  |
Total Outstanding Options, Weighted Average Remaining Term | 5 years 7 months 24 days |  |
Vested and Exercisable Options (in shares) | 222,499 |  |
Vested and Exercisable Options, Weighted Average Option Price per Share (in usd per share) | $ 30.92 |  |
Vested and Exercisable Options, Weighted Average Remaining Term | 5 years 6 months 10 days |  |
Range Two | Minimum |  |  |
Summary of options outstanding segregated by ranges of exercise prices |  |  |
Total Outstanding Options, Weighted Average Option Price per Share (in usd per share) | $ 28.88 |  |
Range Two | Maximum |  |  |
Summary of options outstanding segregated by ranges of exercise prices |  |  |
Total Outstanding Options, Weighted Average Option Price per Share (in usd per share) | $ 32.35 |  |
Range Three |  |  |
Summary of options outstanding segregated by ranges of exercise prices |  |  |
Total Outstanding Options, Options (in shares) | 415,356 |  |
Total Outstanding Options, Weighted Average Option Price per Share (in usd per share) | $ 40.14 |  |
Total Outstanding Options, Weighted Average Remaining Term | 8 years 4 months 9 days |  |
Vested and Exercisable Options (in shares) | 85,766 |  |
Vested and Exercisable Options, Weighted Average Option Price per Share (in usd per share) | $ 41.80 |  |
Vested and Exercisable Options, Weighted Average Remaining Term | 7 years 2 months 8 days |  |
Range Three | Minimum |  |  |
Summary of options outstanding segregated by ranges of exercise prices |  |  |
Total Outstanding Options, Weighted Average Option Price per Share (in usd per share) | $ 38.05 |  |
Range Three | Maximum |  |  |
Summary of options outstanding segregated by ranges of exercise prices |  |  |
Total Outstanding Options, Weighted Average Option Price per Share (in usd per share) | $ 41.95 |  |
Range Four |  |  |
Summary of options outstanding segregated by ranges of exercise prices |  |  |
Total Outstanding Options, Options (in shares) | 210,522 |  |
Total Outstanding Options, Weighted Average Option Price per Share (in usd per share) | $ 42.94 |  |
Total Outstanding Options, Weighted Average Remaining Term | 8 years 3 months 19 days |  |
Vested and Exercisable Options (in shares) | 49,335 |  |
Vested and Exercisable Options, Weighted Average Option Price per Share (in usd per share) | $ 43.00 |  |
Vested and Exercisable Options, Weighted Average Remaining Term | 8 years 2 months 8 days |  |

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