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Share-Based Compensation Plans (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands |  | 12 Months Ended
--- | --- | ---
Feb. 27, 2019 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Common shares, authorized |  | 200,000,000 | 200,000,000 |
Share-based compensation awards, grant exercise price |  | $ 0 |  |
Share units |  | 0 | 0 | 0
Share-based compensation expense |  | $ 34,018 | $ 32,369 | $ 30,297
Income tax benefit recorded |  | 8,384 | 7,401 | 14,824
Additional paid-in capital due to tax benefit from dividends on restricted shares |  | 484 | 403 | 626
Aggregate intrinsic value of options exercised |  | 16,297 | 11,737 | 14,130
Cash received from the exercised share options |  | 8,523 |  |
Tax benefit realized from the options exercised |  | 3,198 |  |
Unrecognized compensation cost |  | 79,780 |  |
Tax benefit from stock options vested |  | 5,774 |  |
Fair value of shares vested |  | $ 28,135 | 25,317 | 23,134
Unrecognized compensation cost expected to be recognized over a weighted-average period, years |  | 3 years 4 months 24 days |  |
Aggregate value of issuances |  | $ 107 | $ 113 | $ 94
Employee Plans, 1995 And 2002 [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Share units |  | 0 |  |
2002 Employee Plan [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Percentage of options and restricted shares granted |  | 20.00% |  |
Vesting period, years |  | 5 years |  |
2010 Employee Plan [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Common shares, authorized |  | 4,000,000 |  |
Remaining shares |  | 2,303,555 |  |
Percentage of options and restricted shares granted |  | 20.00% |  |
Vesting period, years |  | 5 years |  |
2009 Director Plan [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Common shares, authorized |  | 37,439 |  |
Remaining shares |  | 34,957 |  |
Vesting period, years |  | 10 years |  |
2003 Director Plan [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Common shares, authorized |  | 500,000 |  |
Remaining shares |  | 324,913 |  |
Percentage of options and restricted shares granted |  | 33.00% |  |
Vesting period, years |  | 3 years |  |
Key Employees [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Restricted shares issued |  | 2,525,422 |  |
Restricted shares cancelled |  | 331,938 |  |
Non-Employee Directors [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Common shares, issued |  | 459 | 480 | 404
Restricted shares issued |  | 167,618 |  |
Restricted shares cancelled |  | 0 |  |
Common stock acquired for net-share settlement |  | 71,437 | 65,974 | 60,453
Common stock values of shares acquired for net-share settlement |  | $ 14,181 | $ 14,202 | $ 14,240
Restricted Shares [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Share units |  | 232,601 |  |
Performance Shares [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Share units | 16,855 |  |  |
Common stock acquired for net-share settlement |  | 5,008 | 5,214 |
Common stock values of shares acquired for net-share settlement |  | $ 1,119 | $ 1,264 |
Performance Shares [Member] | 2010 Employee Plan [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Percentage of options and restricted shares granted |  | 100.00% |  |
Vesting period, years |  | 3 years |  |
Performance Shares [Member] | 2010 Employee Plan [Member] | Maximum [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Shares of stock per unit awarded |  | 1.75 |  |
Performance Shares [Member] | 2010 Employee Plan [Member] | Minimum [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Shares of stock per unit awarded |  |  |  |
Performance Shares [Member] | 2010 Employee Plan [Member] | Growth In Book Value [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Vesting period, years |  | 3 years |  |
Performance share unit valuation growth, percentage |  | 50.00% |  |
Performance Shares [Member] | 2010 Employee Plan [Member] | Operating Return on Equity [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Performance share unit valuation growth, percentage |  | 50.00% |  |
Employee Stock Option [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Share units |  | 0 |  |

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- Definition The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(ii) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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