Earnings Per Share (Components Of Earnings Per Common Share - Basic And Diluted) (Details) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2021	Jun. 30, 2020
Numerator:
Net Income	$ 14,441	$ 29,879	$ 12,377	$ 54,248	$ 44,320	$ 66,625
Net income attributable to noncontrolling interests	(1,749)		(1,009)		(3,591)	(2,635)
Net income attributable to common shareholders - basic and diluted	$ 12,692		$ 11,368		$ 40,729	$ 63,990
Denominator:
Weighted average shares outstanding - basic (in shares)	126,600		127,242		126,559	127,552
Effect of dilutive securities:
Share options and awards (in shares)	1,039		861		1,096	899
Weighted average shares outstanding - diluted (in shares)	127,639		128,103		127,655	128,451