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Shareholders' Equity, Stock Options and Net Income per Share - Stock Option Activity (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Share-based compensation | $ 8,103 | $ 8,334 | $ 7,486
Employee Stock Option [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Outstanding at beginning of year (shares) | 564 | 786 | 1,363
Granted (shares) | 128 | 137 | 96
Exercise of stock options (in shares) | (206) | (346) | (659)
Forfeited (shares) | (46) | (13) | (14)
Outstanding at end of year (shares) | 440 | 564 | 786
Exercisable at end of year | 226 | 331 | 586
Weighted Average Outstanding at beginning of year (per share) | $ 41 | $ 32 | $ 28
Weighted average exercise price for options granted in the period | 48 | 44 | 50
Weighted average exercise price for options exercised in the period | 35 | 24 | 26
Weighted average exercise price for options forfeited in the period | 46 | 35 | 29
Weighted Average Outstanding at end of year (per share) | 45 | 41 | 32
Weighted average exercise price for options exercisable at year end | 42 | 37 | 28
Weighted-average fair value of options granted during the year (dollars per share) | $ 13 | $ 12 | $ 15
Aggregate intrinsic value of options exercised | $ 3,569 | $ 7,803 | $ 16,191
Average aggregate intrinsic value for options outstanding | 3,387 |  |
Average aggregate instrinsic value for exercisable options | 2,259 |  |
Share-based compensation | 1,313 | 1,473 | 1,386
Tax benefit related to share-based compensation expense | 466 | $ 546 | $ 542
Unrecognized compensation cost | $ 1,647 |  |
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition | 1 year 9 months 11 days |  |
Exercise Price Range 36.55 thru 37.14 [Member] | Employee Stock Option [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Outstanding at end of year (shares) | 83 |  |
Exercisable at end of year | 83 |  |
Weighted Average Outstanding at end of year (per share) | $ 36.85 |  |
Weighted average exercise price for options exercisable at year end | 36.85 |  |
Range of exercise price, lower range limit | 36.55 |  |
Range of exercise price, upper range limit | $ 37.14 |  |
Weighted average remaining contractual life | 1 year 7 months 11 days |  |
Exercise Price Range 41.32 thru 44.90 [Member] | Employee Stock Option [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Outstanding at end of year (shares) | 159 |  |
Exercisable at end of year | 90 |  |
Weighted Average Outstanding at end of year (per share) | $ 43.29 |  |
Weighted average exercise price for options exercisable at year end | 43.07 |  |
Range of exercise price, lower range limit | 41.32 |  |
Range of exercise price, upper range limit | $ 44.90 |  |
Weighted average remaining contractual life | 4 years 5 months 11 days |  |
Exercise Price Range 45.34 thru 48.32 [Member] | Employee Stock Option [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Outstanding at end of year (shares) | 123 |  |
Exercisable at end of year | 10 |  |
Weighted Average Outstanding at end of year (per share) | $ 47.73 |  |
Weighted average exercise price for options exercisable at year end | 46.44 |  |
Range of exercise price, lower range limit | 45.34 |  |
Range of exercise price, upper range limit | $ 48.32 |  |
Weighted average remaining contractual life | 6 years 11 days |  |
Exercise Price Range 50.71 thru 53.73 [Member] | Employee Stock Option [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Outstanding at end of year (shares) | 70 |  |
Exercisable at end of year | 43 |  |
Weighted Average Outstanding at end of year (per share) | $ 51.03 |  |
Weighted average exercise price for options exercisable at year end | 50.81 |  |
Range of exercise price, lower range limit | 50.71 |  |
Range of exercise price, upper range limit | $ 53.73 |  |
Weighted average remaining contractual life | 4 years 3 months 11 days |  |
Exercise Price Range 57.18 thru 57.18 [Member] | Employee Stock Option [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Outstanding at end of year (shares) | 5 |  |
Exercisable at end of year | 0 |  |
Weighted Average Outstanding at end of year (per share) | $ 57.18 |  |
Weighted average exercise price for options exercisable at year end | 0.00 |  |
Range of exercise price, lower range limit | 57.18 |  |
Range of exercise price, upper range limit | $ 57.18 |  |
Weighted average remaining contractual life | 7 years 11 days |  |
Exercise Price Range 36.55 thru 57.18 [Member] | Employee Stock Option [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Outstanding at end of year (shares) | 440 |  |
Exercisable at end of year | 226 |  |
Weighted Average Outstanding at end of year (per share) | $ 44.70 |  |
Weighted average exercise price for options exercisable at year end | 42.39 |  |
Range of exercise price, lower range limit | 36.55 |  |
Range of exercise price, upper range limit | $ 57.18 |  |
Weighted average remaining contractual life | 3 years 6 months 11 days |  |

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