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STOCKHOLDERS' EQUITY (Details 2) (USD $) In Thousands, except Share data, unless otherwise specified | 3 Months Ended |
--- | --- | ---
Mar. 31, 2013 | Mar. 31, 2012 | Dec. 31, 2012
STOCKHOLDERS' EQUITY |  |  |  |
Common stock, shares outstanding | 136,578,350 |  |  | 140,294,092
Earnings per share calculations |  |  |  |
Net income | $ 72,091 |  | $ 68,083 |
Less: Preferred stock dividends | (1,714) |  | (1,714) |
Less: Earnings allocated to participating securities | (584) |  |  |
Basic EPS - income allocated to common stockholders | 69,793 | [1] | 66,369 |
Effect of dilutive securities |  |  |  |
Restricted stock awards | 36 |  | 103 |
Convertible preferred stock | 1,714 |  | 1,714 |
Diluted EPS - income allocated to common stockholders | $ 71,543 | [1] | $ 68,186 |
Number of Shares |  |  |  |
Weighted average shares outstanding | 137,648,000 |  | 145,347,000 |
Effect of dilutive securities on weighted average shares outstanding |  |  |  |
Stock options (in shares) | 51,000 |  | 48,000 |
Restricted stock awards (in shares) | 242,000 |  | 1,030,000 |
Convertible preferred stock (in shares) | 5,578,000 |  | 5,571,000 |
Total weighted average diluted shares outstanding | 143,519,000 |  | 151,996,000 |
Per Share Amounts |  |  |  |
Basic EPS (in dollars per share) | $ 0.51 |  | $ 0.46 |
Diluted EPS - Income available to common stockholders (in dollars per share) | $ 0.50 |  | $ 0.45 |
[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.

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