STOCKHOLDERS' EQUITY AND EARNINGS PER SHARE (Details 2) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013
STOCKHOLDERS' EQUITY AND EARNINGS PER SHARE
Common stock, shares outstanding	143,389,155		143,389,155		137,630,896
Earnings per share calculations
Net income	$ 83,988	$ 74,015	$ 160,729	$ 146,106
Less: Preferred stock dividends		(1,714)		(3,428)
Less: Earnings allocated to participating securities	(119)	(400)	(287)	(988)
Basic EPS - income allocated to common stockholders	83,869	71,901	160,442	141,690
Effect of dilutive securities:
Restricted stock units	51	33	129	68
Convertible preferred stock				3,428
Diluted EPS - income allocated to common stockholders	$ 83,920	$ 71,934	$ 160,571	$ 145,186
Number of Shares
Weighted average shares outstanding	143,187,000	137,536,000	142,578,000	137,592,000
Effect of dilutive securities on weighted average shares outstanding
Stock options (in shares)	75,000	59,000	77,000	55,000
Restricted stock units (in shares)	284,000	221,000	359,000	227,000
Convertible preferred stock (in shares)				3,699,000
Warrants (in shares)	143,000		144,000
Total weighted average diluted shares outstanding	143,689,000	137,816,000	143,158,000	141,573,000
Per Share Amounts
Basic EPS - income allocated to common stockholders (in dollars per share)	$ 0.59	$ 0.52	$ 1.13	$ 1.03
Diluted EPS - Income available to common stockholders (in dollars per share)	$ 0.58	$ 0.52	$ 1.12	$ 1.03