Earnings Per Share (Schedule Of Earnings Per Share) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Earnings Per Share [Abstract]
Net income	$ 10,859	$ 82,667	$ 67,300	$ 144,470
Less: Preferred share dividends	(2,011)	(2,011)	(4,021)	(4,021)
Less: Income from operations attributable to noncontrolling interests	(352)	(1,765)	(2,030)	(3,424)
Less: Earnings allocated to unvested shares	(249)	(226)	(495)	(439)
Net income available for common shareholders, basic and diluted	$ 8,247	$ 78,665	$ 60,754	$ 136,586
Weighted average common shares outstanding, basic and diluted	75,394	74,713	75,377	74,458
Net income available for common shareholders	$ 0.11	$ 1.05	$ 0.81	$ 1.83