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STOCKHOLDERS' EQUITY (Details 2) (USD $) In Thousands, except Share data, unless otherwise specified | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 | Jun. 30, 2012 | Dec. 31, 2012
STOCKHOLDERS' EQUITY |  |  |  |  |
Common stock, shares outstanding | 137,705,407 |  | 137,705,407 |  | 140,294,092
Earnings per share calculations |  |  |  |  |
Net income | $ 74,015 | $ 70,557 | $ 146,106 | $ 138,640 |
Less: Preferred stock dividends | (1,714) | (1,714) | (3,428) | (3,428) |
Less: Earnings allocated to participating securities | (400) | (859) | (988) | (1,718) |
Basic EPS - income allocated to common stockholders | 71,901 | 67,984 | 141,690 | 133,494 |
Effect of dilutive securities: |  |  |  |  |
Restricted stock units | 33 | 7 | 68 | 15 |
Convertible preferred stock |  | 1,714 | 3,428 | 3,428 |
Diluted EPS - income allocated to common stockholders | $ 71,934 | $ 69,705 | $ 145,186 | $ 136,937 |
Number of Shares |  |  |  |  |
Weighted average shares outstanding | 137,536,000 | 142,107,000 | 137,592,000 | 143,727,000 |
Effect of dilutive securities on weighted average shares outstanding |  |  |  |  |
Stock options (in shares) | 59,000 | 36,000 | 55,000 | 41,000 |
Restricted stock units (in shares) | 221,000 | 72,000 | 227,000 | 75,000 |
Convertible preferred stock (in shares) |  | 5,571,000 | 3,699,000 | 5,571,000 |
Total weighted average diluted shares outstanding | 137,816,000 | 147,786,000 | 141,573,000 | 149,414,000 |
Per Share Amounts |  |  |  |  |
Basic EPS - income allocated to common stockholders (in dollars per share) | $ 0.52 | $ 0.48 | $ 1.03 | $ 0.93 |
Diluted EPS - Income available to common stockholders (in dollars per share) | $ 0.52 | $ 0.47 | $ 1.03 | $ 0.92 |

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