STOCKHOLDERS' EQUITY (Details 2) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012
STOCKHOLDERS' EQUITY
Common stock, shares outstanding	137,739,423		137,739,423		140,294,092
Earnings per share calculations
Net income	$ 73,157	$ 71,110	$ 219,263	$ 209,750
Less: Preferred stock dividends		(1,714)	(3,428)	(5,142)
Less: Earnings allocated to participating securities	(372)	(798)	(1,361)	(2,518)
Basic EPS - income allocated to common stockholders	72,785	68,598	214,474	202,090
Effect of dilutive securities:
Restricted stock units	54	14	124	29
Convertible preferred stock		1,714	3,428	5,142
Diluted EPS - income allocated to common stockholders	$ 72,839	$ 70,326	$ 218,026	$ 207,261
Number of Shares
Weighted average shares outstanding	137,036,000	139,621,000	137,404,000	142,348,000
Effect of dilutive securities on weighted average shares outstanding
Stock options (in shares)	71,000	28,000	66,000	36,000
Restricted stock units (in shares)	360,000	138,000	276,000	96,000
Convertible preferred stock (in shares)		5,571,000	2,453,000	5,571,000
Total weighted average diluted shares outstanding	137,467,000	145,358,000	140,199,000	148,051,000
Per Share Amounts
Basic EPS - income allocated to common stockholders (in dollars per share)	$ 0.53	$ 0.49	$ 1.56	$ 1.42
Diluted EPS - Income available to common stockholders (in dollars per share)	$ 0.53	$ 0.48	$ 1.56	$ 1.40