Earnings Per Share (Schedule Of Reconciliation Of Net Income/(Loss) to Net Income/(Loss) Available to Common Shareholders) (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Earnings Per Share [Abstract]
Net income/(loss)	$ 63,332,000	$ 50,498,000	$ 45,884,000	$ 182,406,000
Net income attributable to noncontrolling interest	2,977,000	2,875,000	8,586,000	8,547,000
Net income/(loss) attributable to controlling interest	60,355,000	47,623,000	37,298,000	173,859,000
Preferred stock dividends	1,550,000	1,550,000	4,650,000	4,650,000
Net income/(loss) available to common shareholders	$ 58,805,000	$ 46,073,000	$ 32,648,000	$ 169,209,000
Weighted average common shares outstanding - basic	233,111,000	235,329,000	232,910,000	235,437,000
Effect of dilutive securities	1,947,000	1,533,000	1,928,000	1,732,000
Weighted average common shares outstanding - diluted	235,058,000	236,862,000	234,838,000	237,169,000
Net income/(loss) per share available to common shareholders	$ 0.25	$ 0.2	$ 0.14	$ 0.72
Diluted income/(loss) per share available to common shareholders	$ 0.25	$ 0.19	$ 0.14	$ 0.71