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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