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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, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Share-based compensation | $ 10,549 | $ 8,103 | $ 8,334
Employee Stock Option [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Outstanding at beginning of year (shares) | 440 | 564 | 786
Granted (shares) | 193 | 128 | 137
Exercise of stock options (in shares) | (95) | (206) | (346)
Forfeited (shares) | 0 | (46) | (13)
Outstanding at end of year (shares) | 538 | 440 | 564
Exercisable at end of year | 230 | 226 | 331
Weighted Average Outstanding at beginning of year (per share) | $ 45 | $ 41 | $ 32
Weighted average exercise price for options granted in the period | 62 | 48 | 44
Weighted average exercise price for options exercised in the period | 41 | 35 | 24
Weighted average exercise price for options forfeited in the period | 0 | 46 | 35
Weighted Average Outstanding at end of year (per share) | 51 | 45 | 41
Weighted average exercise price for options exercisable at year end | 45 | 42 | 37
Weighted-average fair value of options granted during the year (dollars per share) | $ 16 | $ 13 | $ 12
Aggregate intrinsic value of options exercised | $ 1,992 | $ 3,569 | $ 7,803
Average aggregate intrinsic value for options outstanding | 4,550 |  |
Average aggregate instrinsic value for exercisable options | 3,439 |  |
Share-based compensation | 1,578 | 1,313 | 1,473
Tax benefit related to share-based compensation expense | 398 | $ 466 | $ 546
Unrecognized compensation cost | $ 3,128 |  |
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition | 2 years 2 months 11 days |  |
Exercise Price Range 36.90 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) | 36 |  |
Exercisable at end of year | 36 |  |
Weighted Average Outstanding at end of year (per share) | $ 37.11 |  |
Weighted average exercise price for options exercisable at year end | 37.11 |  |
Range of exercise price, lower range limit | 36.90 |  |
Range of exercise price, upper range limit | $ 37.14 |  |
Weighted average remaining contractual life | 1 year 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) | 135 |  |
Exercisable at end of year | 101 |  |
Weighted Average Outstanding at end of year (per share) | $ 43.39 |  |
Weighted average exercise price for options exercisable at year end | 43.33 |  |
Range of exercise price, lower range limit | 41.32 |  |
Range of exercise price, upper range limit | $ 44.90 |  |
Weighted average remaining contractual life | 3 years 6 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) | 116 |  |
Exercisable at end of year | 42 |  |
Weighted Average Outstanding at end of year (per share) | $ 47.76 |  |
Weighted average exercise price for options exercisable at year end | 47.61 |  |
Range of exercise price, lower range limit | 45.34 |  |
Range of exercise price, upper range limit | $ 48.32 |  |
Weighted average remaining contractual life | 5 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) | 53 |  |
Exercisable at end of year | 49 |  |
Weighted Average Outstanding at end of year (per share) | $ 51.13 |  |
Weighted average exercise price for options exercisable at year end | 50.95 |  |
Range of exercise price, lower range limit | 50.71 |  |
Range of exercise price, upper range limit | $ 53.73 |  |
Weighted average remaining contractual life | 3 years 4 months 11 days |  |
Exercise Price Range 57.18 thru 60.42 [Member] | Employee Stock Option [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Outstanding at end of year (shares) | 98 |  |
Exercisable at end of year | 2 |  |
Weighted Average Outstanding at end of year (per share) | $ 58.78 |  |
Weighted average exercise price for options exercisable at year end | 57.18 |  |
Range of exercise price, lower range limit | 57.18 |  |
Range of exercise price, upper range limit | $ 60.42 |  |
Weighted average remaining contractual life | 6 years 1 month 11 days |  |
Exercise Price Range 64.26 thru 64.26 [Member] | Employee Stock Option [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Outstanding at end of year (shares) | 100 |  |
Weighted Average Outstanding at end of year (per share) | $ 64.26 |  |
Range of exercise price, lower range limit | 64.26 |  |
Range of exercise price, upper range limit | $ 64.26 |  |
Weighted average remaining contractual life | 6 years 8 months 11 days |  |
Exercise Price Range 36.90 thru 64.26 [Member] | Employee Stock Option [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Outstanding at end of year (shares) | 538 |  |
Exercisable at end of year | 230 |  |
Weighted Average Outstanding at end of year (per share) | $ 51.37 |  |
Weighted average exercise price for options exercisable at year end | 44.89 |  |
Range of exercise price, lower range limit | 36.90 |  |
Range of exercise price, upper range limit | $ 64.26 |  |
Weighted average remaining contractual life | 4 years 8 months 11 days |  |

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