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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