Note 5. Earnings Per Common Share (Detail) - Weighted Average Common Shares (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Net income (loss)	$ (885)	$ 55,921	$ 14,211	$ 132,595
Preferred stock dividends	(138)	(138)	(414)	(414)
Net income (loss) applicable to common shares for basic and diluted earnings per share	$ (1,023)	$ 55,783	$ 13,797	$ 132,181
Basic weighted average common shares (in Shares)	285,492	279,541	285,400	279,067
Dilutive stock options and restricted stock (in Shares)		15,459	11,339	16,672
Diluted weighted average common shares (in Shares)	285,492	295,000	296,739	295,739
Net income applicable to common shares (in Dollars per share)	$ 0.00	$ 0.20	$ 0.05	$ 0.47
Net income applicable to common shares (in Dollars per share)	$ 0.00	$ 0.19	$ 0.05	$ 0.45