STOCKHOLDERS' EQUITY (Details 3) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011	Dec. 31, 2011
STOCKHOLDERS' EQUITY
Common stock, shares outstanding	144,870,621		149,327,907
Earnings per share calculations
Net income	$ 68,083	$ 56,071
Less: Preferred stock dividends	(1,714)	(1,715)
Basic EPS - income available to common stockholders	66,369	54,356
Effect of dilutive securities
Restricted stock awards	103	7
Convertible preferred stock	1,714	1,715
Diluted EPS - income available to common stockholders	$ 68,186	$ 56,078
Number of Shares
Weighted average shares outstanding	145,347,000	146,837,000
Effect of dilutive securities on weighted average shares outstanding
Stock options (in shares)	48,000	120,000
Restricted stock awards (in shares)	1,030,000	675,000
Convertible preferred stock (in shares)	5,571,000	5,571,000
Stock warrants (in shares)		131,000
Total weighted average diluted shares outstanding	151,996,000	153,334,000
Per Share Amounts
Basic EPS (in dollars per share)	$ 0.46	$ 0.37
Diluted EPS - Income available to common stockholders (in dollars per share)	$ 0.45	$ 0.37