STOCKHOLDERS' EQUITY (Details 3) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended			9 Months Ended
	Sep. 30, 2012		Sep. 30, 2011	Sep. 30, 2012		Sep. 30, 2011	Dec. 31, 2011
STOCKHOLDERS' EQUITY
Common stock, shares outstanding	140,300,832			140,300,832			149,327,907
Earnings per share calculations
Net income	$ 71,110		$ 62,432	$ 209,750		$ 179,028
Less: Preferred stock dividends	(1,714)		(1,714)	(5,142)		(5,143)
Less: Earnings allocated to participating securities	(798)			(2,518)
Basic EPS - income allocated to common stockholders	68,598	[1]	60,718	202,090	[1]	173,885
Effect of dilutive securities
Restricted stock awards	14		34	29		75
Convertible preferred stock	1,714		1,714	5,142		5,143
Diluted EPS - income allocated to common stockholders	$ 70,326	[1]	$ 62,466	$ 207,261	[1]	$ 179,103
Number of Shares
Weighted average shares outstanding	139,621,000	[1]	147,162,000	142,348,000	[1]	147,013,000
Effect of dilutive securities on weighted average shares outstanding
Stock options (in shares)	28,000		37,000	36,000		74,000
Restricted stock awards (in shares)	138,000		683,000	96,000		681,000
Convertible preferred stock (in shares)	5,571,000		5,571,000	5,571,000		5,571,000
Stock warrants (in shares)						33,000
Total weighted average diluted shares outstanding	145,358,000	[1]	153,453,000	148,051,000	[1]	153,372,000
Per Share Amounts
Basic EPS (in dollars per share)	$ 0.49	[1]	$ 0.41	$ 1.42	[1]	$ 1.18
Diluted EPS - Income available to common stockholders (in dollars per share)	$ 0.48	[1]	$ 0.41	$ 1.40	[1]	$ 1.17

[1] On April 1, 2012, the Company revised its calculation of earnings per share to account for participating securities under the two-class method. This revision to the earnings per share calculation does not have an impact to previous periods as the amounts are immaterial.