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CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY (unaudited) (USD $) In Thousands, except Share data, unless otherwise specified | Common Stock | Additional Paid-in Capital | Retained Earnings | Accumulated Other Comprehensive Loss, Net of Taxes | Total
--- | --- | --- | --- | --- | ---
Balance at at Dec. 31, 2011 | $ 1,299 | $ 826,121 | $ 523,787 | $ (7,896) | $ 1,343,311
Balance at (in shares) at Dec. 31, 2011 | 129,899,288 |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Net income |  |  | 64,182 |  | 64,182
Conversion of 3.25% Convertible Notes | 46 | 56,364 |  |  | 56,410
Conversion of 3.25% Convertible Notes (in shares) | 4,635,159 |  |  |  |
Exercise of common stock options | 4 | 1,220 |  |  | 1,224
Exercise of common stock options (in shares) | 342,371 |  |  |  |
Equity-based compensation |  | 3,374 |  |  | 3,374
Equity-based compensation (in shares) | 8,877 |  |  |  |
Other comprehensive income (loss), net of income taxes |  |  |  | 1,072 | 1,072
Balance at at Jun. 30, 2012 | 1,349 | 887,079 | 587,969 | (6,824) | 1,469,573
Balance at (in shares) at Jun. 30, 2012 | 134,885,695 |  |  |  |
Balance at at Dec. 31, 2012 | 1,356 | 911,942 | 704,565 | (6,441) | 1,611,422
Balance at (in shares) at Dec. 31, 2012 | 135,637,932 |  |  |  | 135,637,932
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Net income |  |  | 121,868 |  | 121,868
Preferred stock dividends ($18.54 per share) |  |  | (3,004) |  | (3,004)
Deemed dividend related to beneficial conversion feature of preferred stock |  |  | (2,172) |  | (2,172)
Exercise of common stock options | 2 | 569 |  |  | 571
Exercise of common stock options (in shares) | 105,029 |  |  |  |
Equity-based compensation |  | 2,886 |  |  | 2,886
Equity-based compensation (in shares) | 12,031 |  |  |  |
Other comprehensive income (loss), net of income taxes |  |  |  | (5,373) | (5,373)
Balance at at Jun. 30, 2013 | $ 1,358 | $ 915,397 | $ 821,257 | $ (11,814) | $ 1,726,198
Balance at (in shares) at Jun. 30, 2013 | 135,754,992 |  |  |  | 135,754,992

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