STOCKHOLDERS' EQUITY AND EARNINGS PER SHARE (Details 2) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013
STOCKHOLDERS' EQUITY AND EARNINGS PER SHARE
Common stock, shares outstanding	143,405,133		143,405,133		137,630,896
Earnings per share calculations
Net income	$ 88,756	$ 73,157	$ 249,485	$ 219,263
Less: Preferred stock dividends				(3,428)
Less: Earnings allocated to participating securities	(118)	(372)	(407)	(1,361)
Basic EPS - income allocated to common stockholders	88,638	72,785	249,078	214,474
Effect of dilutive securities:
Restricted stock units	69	54	197	124
Convertible preferred stock				3,428
Diluted EPS - income allocated to common stockholders	$ 88,707	$ 72,839	$ 249,275	$ 218,026
Number of Shares
Weighted average shares outstanding	143,210,000	137,036,000	142,791,000	137,404,000
Effect of dilutive securities on weighted average shares outstanding
Stock options (in shares)	75,000	71,000	76,000	66,000
Restricted stock units (in shares)	381,000	360,000	365,000	276,000
Convertible preferred stock (in shares)				2,453,000
Warrants (in shares)	144,000		145,000
Total weighted average diluted shares outstanding	143,810,000	137,467,000	143,377,000	140,199,000
Per Share Amounts
Basic EPS - income allocated to common stockholders (in dollars per share)	$ 0.62	$ 0.53	$ 1.74	$ 1.56
Diluted EPS - Income available to common stockholders (in dollars per share)	$ 0.62	$ 0.53	$ 1.74	$ 1.56