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Condensed Consolidated Statements of Changes in Shareholders' Equity (USD $) In Thousands, except Share data, unless otherwise specified | Total USD ($) | Preferred Stock | Common Stock USD ($) | Additional Paid-In Capital USD ($) | Retained Deficit USD ($) | Accumulated Other Comprehensive Income (Loss) USD ($)
--- | --- | --- | --- | --- | --- | ---
Balance at Dec. 31, 2012 | $ 2,250,929 |  | $ 769 | $ 1,451,965 | $ 795,173 | $ 3,022
Balance (in shares) at Dec. 31, 2012 |  | 12,275 | 77,446,601 |  |  |
Increase (Decrease) in Shareholders' Equity |  |  |  |  |  |
Repurchase of preferred stock | (22,275) |  |  | (22,275) |  |
Repurchase of preferred stock (in shares) |  | (225) |  |  |  |
Stock option activity, including tax benefit of $7300 and $2717 for three months ended March 31, 2014 and 2013, respectively | 24,737 |  | 5 | 24,732 |  |
Stock option activity, (in shares) |  |  | 540,567 |  |  |
Restricted stock activity, including tax benefit of $749 and $452 for the three months ended March 31, 2014 and 2013, respectively | 442 |  |  | 442 |  |
Restricted stock activity, (in shares) |  |  | 188,013 |  |  |
Change in fair value of corporate debt securities | (99) |  |  |  |  | (99)
Foreign currency translation adjustment | (391) |  |  |  |  | (391)
Net income | 65,271 |  |  |  | 65,271 |
Balance at Mar. 31, 2013 | 2,318,614 |  | 774 | 1,454,864 | 860,444 | 2,532
Balance (in shares) at Mar. 31, 2013 |  | 12,050 | 78,175,181 |  |  |
Balance at Dec. 31, 2013 | 758,400 |  | 775 | 887,556 | (130,314) | 383
Balance (in shares) at Dec. 31, 2013 |  | 8,624 | 77,788,393 |  |  |
Increase (Decrease) in Shareholders' Equity |  |  |  |  |  |
Stock option activity, including tax benefit of $7300 and $2717 for three months ended March 31, 2014 and 2013, respectively | 15,486 |  | 8 | 15,478 |  |
Stock option activity, (in shares) |  |  | 813,456 |  |  |
Restricted stock activity, including tax benefit of $749 and $452 for the three months ended March 31, 2014 and 2013, respectively | 426 |  | (3) | 429 |  |
Restricted stock activity, (in shares) |  |  | (46,734) |  |  |
Foreign currency translation adjustment | (700) |  |  |  |  | (700)
Net income | 4,537 |  |  |  | 4,537 |
Balance at Mar. 31, 2014 | $ 778,149 |  | $ 780 | $ 903,463 | $ (125,777) | $ (317)
Balance (in shares) at Mar. 31, 2014 |  | 8,624 | 78,555,115 |  |  |

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