Earnings Per Share (Schedule Of Reconciliation Of Net Income/(Loss) to Net Income/(Loss) Available to Common Shareholders) (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Earnings Per Share [Abstract]
Net income/(loss)	$ 54,957,000	$ 81,929,000	$ (17,448,000)	$ 131,908,000
Net income attributable to noncontrolling interest	2,851,000	2,859,000	5,609,000	5,672,000
Net income/(loss) attributable to controlling interest	52,106,000	79,070,000	(23,057,000)	126,236,000
Preferred stock dividends	1,550,000	1,550,000	3,100,000	3,100,000
Net income/(loss) available to common shareholders	$ 50,556,000	$ 77,520,000	$ (26,157,000)	$ 123,136,000
Weighted average common shares outstanding - basic	232,800,000	235,797,000	232,808,000	235,492,000
Effect of dilutive securities	1,869,000	1,453,000	0	1,833,000
Weighted average common shares outstanding - diluted	234,669,000	237,250,000	232,808,000	237,325,000
Net income/(loss) per share available to common shareholders	$ 0.22	$ 0.33	$ (0.11)	$ 0.52
Diluted income/(loss) per share	$ 0.22	$ 0.33	$ (0.11)	$ 0.52