Net Earnings Per Common Share (Basic And Diluted Net Earnings Per Common Share Based On The Weighted Average Outstanding Shares) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2010	Sep. 30, 2010	Jun. 30, 2010	Mar. 31, 2010	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Net Earnings Per Common Share [Abstract]
Net income (loss) applicable to controlling interest, Basic	$ 89,019	$ 109,093	$ 72,875	$ 52,817	$ (72,200)	$ (47,325)	$ (112,993)	$ (60,210)	$ 323,804	$ (292,728)	$ (1,216,111)
Less common and preferred dividends, Basic									177,775	126,427	30,198
Undistributed earnings (loss), Basic									146,029	(419,155)	(1,246,309)
Less undistributed earnings applicable to nonvested restricted shares, Basic									1,300
Undistributed earnings (loss) applicable to nonvested shares, Basic									144,729	(419,155)	(1,246,309)
Distributed earnings applicable to common shares, Basic									7,292	6,565	11,773
Net earnings (loss) applicable to common shareholders									152,021	(412,590)	(1,234,536)
Weighted average common shares outstanding									182,393	166,054	124,443
Net earnings (loss) per common share, Basic	$ 0.24	$ 0.35	$ 0.16	$ 0.08	$ (0.62)	$ (0.47)	$ (0.84)	$ (0.57)	$ 0.83	$ (2.48)	$ (9.92)
Additional undistributed earnings allocated to incremental shares, Diluted									41
Diluted earnings (loss) applicable to common shares, Diluted									$ 152,062	$ (412,590)	$ (1,234,536)
Additional weighted average dilutive shares, Diluted									212
Weighted average diluted common shares outstanding, Diluted									182,605	166,054	124,443
Net earnings (loss) per common share, Diluted	$ 0.24	$ 0.35	$ 0.16	$ 0.08	$ (0.62)	$ (0.47)	$ (0.84)	$ (0.57)	$ 0.83	$ (2.48)	$ (9.92)