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Share-Based Compensation Plans (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands |  |  |  | 12 Months Ended
--- | --- | --- | --- | ---
Nov. 18, 2020 | Sep. 11, 2020 | Feb. 26, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Common shares, authorized |  |  |  | 200,000,000 | 200,000,000 |
Grants in period |  |  |  |  | 0 |
Share-based compensation awards, grant exercise price |  |  |  | $ 0 |  |
Share-based compensation expense |  |  |  | $ 39,209 | $ 34,018 | $ 32,369
Income tax benefit recorded |  |  |  | 7,107 | 8,384 | 7,401
Additional paid-in capital due to tax benefit from dividends on restricted shares |  |  |  | 583 | 484 | 403
Unrecognized compensation cost |  |  |  | 88,233 |  |
Tax benefit from stock options vested |  |  |  | 8,519 |  |
Fair value of shares vested |  |  |  | $ 38,745 | $ 28,135 | $ 25,317
Unrecognized compensation cost expected to be recognized over a weighted-average period, years |  |  |  | 3 years 4 months 24 days |  |
2020 Employee Plan [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Common shares, authorized |  |  |  | 1,400,000 |  |
Remaining shares |  |  |  | 1,366,900 |  |
1995 and 2002 Employee Plans [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Grants in period |  |  |  | 0 |  |
2009 Director Plan [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Common shares, authorized |  |  |  | 37,439 |  |
Remaining shares |  |  |  | 34,957 |  |
2003 Director Plan [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Common shares, authorized |  |  |  | 500,000 |  |
Remaining shares |  |  |  | 316,702 |  |
Key Employees [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Restricted shares issued |  |  |  | 2,718,140 |  |
Restricted shares cancelled |  |  |  | 369,164 |  |
Non-Employee Directors [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Common shares, issued |  |  |  | 593 | 459 | 480
Restricted shares issued |  |  |  | 175,829 |  |
Restricted shares cancelled |  |  |  | 0 |  |
Aggregate value of issuances |  |  |  | $ 125 | $ 107 | $ 113
Options and Restricted Shares [Member] | 2020 Employee Plan [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Vesting period, years |  |  |  | 5 years |  |
Options and Restricted Shares [Member] | 2020 Employee Plan [Member] | Share Based Compensation Award Tranche One [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Vesting percentage |  |  |  | 20.00% |  |
Options and Restricted Shares [Member] | 2003 Director Plan [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Vesting period, years |  |  |  | 3 years |  |
Options and Restricted Shares [Member] | 2003 Director Plan [Member] | Share Based Compensation Award Tranche One [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Vesting percentage |  |  |  | 33.00% |  |
Options and Restricted Shares [Member] | 2010 Employee Plan [Member] | Share Based Compensation Award Tranche One [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Vesting percentage |  |  |  | 20.00% |  |
Options and Restricted Shares [Member] | 2002 Employee Plan [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Vesting period, years |  |  |  | 5 years |  |
Options and Restricted Shares [Member] | 2002 Employee Plan [Member] | Share Based Compensation Award Tranche One [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Vesting percentage |  |  |  | 20.00% |  |
Options and Restricted Shares [Member] | Non-Employee Directors [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Common stock acquired for net-share settlement |  |  |  | 66,289 | 71,437 | 65,974
Common stock values of shares acquired for net-share settlement |  |  |  | $ 17,889 | $ 14,181 | $ 14,202
Restricted Shares [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Grants in period |  |  |  | 200,929 |  |
Weighted-average grant-date fair value of options granted | $ 238.0975 | $ 207.505 | $ 277.145 |  |  |
Performance Shares [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Grants in period |  |  |  | 16,120 |  |
Weighted-average grant-date fair value of options granted |  |  | $ 277.145 |  |  |
Performance Shares [Member] | 2020 Employee Plan [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Vesting percentage |  |  |  | 100.00% |  |
Vesting period, years |  |  |  | 3 years |  |
Performance Shares [Member] | 2020 Employee Plan [Member] | Maximum [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Shares of stock per unit awarded |  |  |  |  |  |
Performance Shares [Member] | 2020 Employee Plan [Member] | Minimum [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Shares of stock per unit awarded |  |  |  | 1.75 |  |
Performance Shares [Member] | Non-Employee Directors [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Common stock acquired for net-share settlement |  |  |  | 2,587 | 5,008 | 5,214
Common stock values of shares acquired for net-share settlement |  |  |  | $ 717 | $ 1,119 | $ 1,264
Employee Stock Option [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Grants in period |  |  |  | 0 | 0 | 0
Aggregate intrinsic value of options exercised |  |  |  | $ 9,982 | $ 16,297 | $ 11,737
Cash received from the exercised share options |  |  |  | 4,613 |  |
Tax benefit realized from the options exercised |  |  |  | $ 1,904 |  |
Employee Stock Option [Member] | 2009 Director Plan [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Vesting period, years |  |  |  | 10 years |  |

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