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Share Options And Awards (Narrative) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options outstanding (in shares)	207,416	279,877	828,354	934,201
Net compensation expense for share options and restricted shares	$ 8,300,000	$ 7,300,000	$ 8,600,000
Net capitalized compensation expense	800,000	1,100,000	1,700,000
Share Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total intrinsic value of options exercised	900,000	3,600,000	$ 1,700,000
Unrecognized compensation cost, share options	0
Share Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost, restricted shares	$ 2,100,000	$ 1,800,000
Weighted average expected amortization period for unrecognized compensation cost (in years)	1 year 9 months 18 days	1 year 8 months 12 days
2010 Restated LT Incentive Plan Stock Options and Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Plan common shares authorized (in shares)	4,000,000.0
Plan common shares available for future grants (in shares)	1,000,000.0