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Stock-Based Compensation Plans and Employee Benefits (Details 2) (USD $) In Millions, except Share data, unless otherwise specified | 12 Months Ended | 1 Months Ended | 12 Months Ended | 1 Months Ended |  | 1 Months Ended | 12 Months Ended | 3 Months Ended | 12 Months Ended
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Dec. 31, 2012 Restricted stock units | Dec. 31, 2011 Restricted stock units | Dec. 31, 2010 Restricted stock units | Jan. 31, 2012 Amended restricted stock units that vested on January 1, 2012 | Dec. 31, 2011 Common stock equivalents | Dec. 31, 2012 Employees Restricted stock units | Feb. 29, 2012 Employees Service based restricted stock units that vested on February 17, 2012 | Dec. 31, 2012 Employees Service based restricted stock units with specified vesting dates | Mar. 31, 2012 Company's chairman and chief executive officer Performance-based restricted stock units | Dec. 31, 2012 Company's chairman and chief executive officer Service-based restricted stock units installments | Sep. 30, 2011 Executives and other officers Market-condition based restricted stock units granted on December 19, 2008, modified and measured on July 1, 2011 | Dec. 31, 2012 Executives and other officers Market-condition based restricted stock units granted on December 19, 2008, modified and measured on July 1, 2011 installments | Dec. 31, 2012 Directors CSE and restricted stock units | Dec. 31, 2012 Former director CSE and restricted stock units | Dec. 31, 2012 Minimum Employees Service based restricted stock units with specified vesting dates | Dec. 31, 2012 Maximum Employees Service based restricted stock units with specified vesting dates
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total fair value of restricted stock units vested | $ 29.1 | $ 15.5 | $ 1.7 |  |  |  |  |  |  |  |  |  |  |  |  |
Vested (in shares) | 4,595,000 |  |  | 1,947,551 |  | 4,594,572 | 1,340,620 |  | 806,518 |  |  |  |  |  |  |
Amount RSU's issued net of statuatory minimum required tax witholdings (in shares) |  |  |  |  |  | 2,610,816 |  |  |  |  |  |  |  |  |  |
Shares outstanding (in shares) | 5,276,000 | 9,985,000 |  |  |  |  |  | 637,485 |  | 1,200,000 |  | 3,438,607 | 384,751 |  |  |
Vesting installments |  |  |  |  |  |  |  |  |  | 2 |  | 2 |  |  |  |
Percentage of original units granted equal to amended units |  |  |  |  |  |  |  |  |  |  | 75.00% |  |  |  |  |
Vesting term |  |  |  |  |  |  |  |  |  |  |  |  | 1 year |  | 2 years | 5 years
Shares awarded (in shares) |  |  |  |  |  |  |  |  |  |  |  |  | 77,113 |  |  |
Grant date fair value (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  | $ 5.67 |  |  |
Shares issued for settlement (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  | 35,476 |  |
Adjustment to Additional paid-in capital on account of modification of liability based awards to equity awards |  |  |  |  | 2.4 |  |  |  |  |  |  |  |  |  |  |
Aggregate intrinsic value for directors |  |  |  |  |  |  |  |  |  |  |  |  | $ 3.1 |  |  |

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