Earnings Per Share (Schedule Of Reconciliation Of Net Income/(Loss) to Net Income/(Loss) Available to Common Shareholders) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Earnings Per Share [Abstract]
Net income/(loss)	$ 67,635	$ 63,332	$ 180,788	$ 45,884
Net income attributable to noncontrolling interest	2,883	2,977	8,586	8,586
Net income/(loss) attributable to controlling interest	64,752	60,355	172,202	37,298
Preferred stock dividends	1,550	1,550	4,650	4,650
Net income/(loss) available to common shareholders	$ 63,202	$ 58,805	$ 167,552	$ 32,648
Weighted average common shares outstanding - basic	231,856,000	233,111,000	232,690,000	232,910,000
Effect of dilutive securities	2,236,000	1,947,000	2,085,000	1,928,000
Weighted average common shares outstanding - diluted	234,092,000	235,058,000	234,775,000	234,838,000
Net income/(loss) per share available to common shareholders	$ 0.27	$ 0.25	$ 0.72	$ 0.14
Diluted income/(loss) per share available to common shareholders	$ 0.27	$ 0.25	$ 0.71	$ 0.14