Share Options And Awards (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options outstanding (in shares)	2,366,650	2,897,123	3,543,746	4,085,702
Net compensation expense for share options and restricted shares	$ 7,400	$ 7,900	$ 8,800
Net capitalized compensation expense	$ 1,500	2,300	2,400
Long-Term Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options outstanding (in shares)	1,800,000
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)	3,000,000
Plan common shares available for future grants (in shares)	1,100,000
Share Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total intrinsic value of options exercised	$ 900	4,200	$ 3,200
Unrecognized compensation cost, share options	$ 50	$ 500
Weighted average expected amortization period for unrecognized compensation cost (in years)	2 months	9 months
Restricted Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost, restricted shares	$ 2,200	$ 2,700
Weighted average expected amortization period for unrecognized compensation cost (in years)	9 months	11 months