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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, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Summary of options outstanding segregated by ranges of exercise prices |  |  |
Total Outstanding Options, Options (in shares) | 719,015 | 747,032 | 669,693
Total Outstanding Options, Weighted Average Option Price per Share (in usd per share) | $ 32.80 | $ 27.67 |
Total Outstanding Options, Weighted Average Remaining Term | 7 years 4 months 13 days |  |
Vested and Exercisable Options (in shares) | 258,321 | 273,117 |
Vested and Exercisable Options, Weighted Average Option Price per Share (in usd per share) | $ 27.12 | $ 22.73 | $ 19.32
Vested and Exercisable Options, Weighted Average Remaining Term | 5 years 5 months 5 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) | $ 17.01 |  |
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 One |  |  |
Summary of options outstanding segregated by ranges of exercise prices |  |  |
Total Outstanding Options, Options (in shares) | 78,774 |  |
Total Outstanding Options, Weighted Average Option Price per Share (in usd per share) | $ 19.30 |  |
Total Outstanding Options, Weighted Average Remaining Term | 1 year 6 months 18 days |  |
Vested and Exercisable Options (in shares) | 78,774 |  |
Vested and Exercisable Options, Weighted Average Option Price per Share (in usd per share) | $ 19.30 |  |
Vested and Exercisable Options, Weighted Average Remaining Term | 1 year 6 months 18 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) | 424,057 |  |
Total Outstanding Options, Weighted Average Option Price per Share (in usd per share) | $ 30.81 |  |
Total Outstanding Options, Weighted Average Remaining Term | 7 years 6 months 10 days |  |
Vested and Exercisable Options (in shares) | 177,686 |  |
Vested and Exercisable Options, Weighted Average Option Price per Share (in usd per share) | $ 30.49 |  |
Vested and Exercisable Options, Weighted Average Remaining Term | 7 years 1 month 13 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) | 216,184 |  |
Total Outstanding Options, Weighted Average Option Price per Share (in usd per share) | $ 41.62 |  |
Total Outstanding Options, Weighted Average Remaining Term | 9 years 2 months 1 day |  |
Vested and Exercisable Options (in shares) | 1,861 |  |
Vested and Exercisable Options, Weighted Average Option Price per Share (in usd per share) | $ 36.04 |  |
Vested and Exercisable Options, Weighted Average Remaining Term | 8 years 8 months 23 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) | $ 36.04 |  |
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 |  |

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