Earnings Per Share (Schedule Of Reconciliation Of Net Income/(Loss) to Net Income/(Loss) Available to Common Shareholders) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Earnings Per Share [Abstract]
Net income/(loss)	$ 85,992	$ 95,204	$ 180,986	$ 153,592
Net income attributable to noncontrolling interest	2,852	2,852	5,672	5,672
Net income/(loss) attributable to controlling interest	83,140	92,352	175,314	147,920
Preferred stock dividends	1,550	1,550	3,100	3,100
Net income/(loss) available to common shareholders	$ 81,590	$ 90,802	$ 172,214	$ 144,820
Weighted average common shares outstanding - basic (in shares)	325,153	233,482	325,817	233,280
Effect of dilutive securities (in shares)	3,273	2,781	3,536	2,945
Weighted average common shares outstanding - diluted (in shares)	328,426	236,263	329,353	236,225
Net income/(loss) per share available to common shareholders (in dollars per share)	$ 0.25	$ 0.39	$ 0.53	$ 0.62
Diluted income/(loss) per share available to common shareholders (in dollars per share)	$ 0.25	$ 0.38	$ 0.52	$ 0.61