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		6 Months Ended
		Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Earnings Per Share [Abstract]
Net income/(loss)		$ 60,940	$ 54,957	$ 113,153	$ (17,448)
Net income attributable to noncontrolling interest		2,852	2,851	5,703	5,609
Net income/(loss) attributable to controlling interest		58,088	52,106	107,450	(23,057)
Preferred stock dividends		1,550	1,550	3,100	3,100
Net income/(loss) available to common shareholders		$ 56,538	$ 50,556	$ 104,350	$ (26,157)
Weighted average common shares outstanding - basic		231,573,000	232,800,000	233,112,000	232,808,000
Effect of dilutive securities	[1]	2,003,000	1,869,000	2,009,000	0
Weighted average common shares outstanding - diluted		233,576,000	234,669,000	235,121,000	232,808,000
Net income/(loss) per share available to common shareholders		$ 0.24	$ 0.22	$ 0.45	$ (0.11)
Diluted income/(loss) per share available to common shareholders		$ 0.24	$ 0.22	$ 0.44	$ (0.11)

[1] For the six months ended June 30, 2015 all potential common shares were antidilutive due to the net loss available to common shareholders.