Earnings Per Share (Schedule Of Earnings Per Share) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Net income	$ 61,803	$ 62,931
Less: Preferred share dividends	(2,010)	(2,010)
Less: Income from operations attributable to noncontrolling interests	(1,659)	(1,684)
Less: Earnings allocated to unvested shares	(220)	(253)
Net income available for common shareholders, basic and diluted	$ 57,914	$ 58,984
Weighted average common shares outstanding—basic	74,200	72,905
Stock options	0	63
Weighted average common shares outstanding—diluted	74,200	72,968
Earnings per common share, basic	$ 0.78	$ 0.81
Earnings per common share, diluted	$ 0.78	$ 0.81