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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, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Summary of options outstanding segregated by ranges of exercise prices |  |  |
Total Outstanding Options, Options (in shares) | 774,821 | 719,015 | 747,032
Total Outstanding Options, Weighted Average Option Price per Share (in usd per share) | $ 36.65 | $ 32.80 |
Total Outstanding Options, Weighted Average Remaining Term | 7 years 6 months |  |
Vested and Exercisable Options (in shares) | 271,116 | 258,321 |
Vested and Exercisable Options, Weighted Average Option Price per Share (in usd per share) | $ 31.42 | $ 27.12 | $ 22.73
Vested and Exercisable Options, Weighted Average Remaining Term | 5 years 11 months 23 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) | $ 41.95 |  |
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) | 36,524 |  |
Total Outstanding Options, Weighted Average Option Price per Share (in usd per share) | $ 19.77 |  |
Total Outstanding Options, Weighted Average Remaining Term | 9 months 25 days |  |
Vested and Exercisable Options (in shares) | 36,524 |  |
Vested and Exercisable Options, Weighted Average Option Price per Share (in usd per share) | $ 19.77 |  |
Vested and Exercisable Options, Weighted Average Remaining Term | 9 months 25 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) | $ 17.01 |  |
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) | 320,897 |  |
Total Outstanding Options, Weighted Average Option Price per Share (in usd per share) | $ 31.01 |  |
Total Outstanding Options, Weighted Average Remaining Term | 6 years 8 months 5 days |  |
Vested and Exercisable Options (in shares) | 183,685 |  |
Vested and Exercisable Options, Weighted Average Option Price per Share (in usd per share) | $ 30.85 |  |
Vested and Exercisable Options, Weighted Average Remaining Term | 6 years 4 months 24 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) | $ 33.41 |  |
Range Three |  |  |
Summary of options outstanding segregated by ranges of exercise prices |  |  |
Total Outstanding Options, Options (in shares) | 199,452 |  |
Total Outstanding Options, Weighted Average Option Price per Share (in usd per share) | $ 41.82 |  |
Total Outstanding Options, Weighted Average Remaining Term | 8 years 2 months 8 days |  |
Vested and Exercisable Options (in shares) | 50,907 |  |
Vested and Exercisable Options, Weighted Average Option Price per Share (in usd per share) | $ 41.82 |  |
Vested and Exercisable Options, Weighted Average Remaining Term | 8 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) | 217,948 |  |
Total Outstanding Options, Weighted Average Option Price per Share (in usd per share) | $ 43.05 |  |
Total Outstanding Options, Weighted Average Remaining Term | 9 years 2 months 8 days |  |
Vested and Exercisable Options (in shares) | 0 |  |
Vested and Exercisable Options, Weighted Average Option Price per Share (in usd per share) | $ 0 |  |
Vested and Exercisable Options, Weighted Average Remaining Term | 0 years |  |

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