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Share-Based Compensation Employee Share-Based Compensation Plans (Details) (USD $)
In Millions, except Share data, unless otherwise specified
9 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 1 Months Ended 1 Months Ended 1 Months Ended
Sep. 30, 2013
Sep. 30, 2013
2008 Plan [Member]
Sep. 30, 2012
2008 Plan [Member]
Sep. 30, 2013
2008 Plan [Member]
Sep. 30, 2012
2008 Plan [Member]
Sep. 30, 2013
2011 Plan [Member]
Sep. 30, 2012
2011 Plan [Member]
Sep. 30, 2013
2011 Plan [Member]
Sep. 30, 2012
2011 Plan [Member]
Sep. 30, 2013
Amended and Restated 2011 Plan [Member]
Dec. 31, 2010
December 2010 Stock Option Award [Member]
Sep. 30, 2013
December 2010 Stock Option Award [Member]
Sep. 30, 2013
September 2013 Stock Option Award [Member]
Jul. 31, 2012
July 2012 Stock Option Award [Member]
Sep. 30, 2013
July 2012 Stock Option Award [Member]
Jul. 31, 2011
July 2011 Stock Option Award [Member]
Sep. 30, 2013
July 2011 Stock Option Award [Member]
Sep. 30, 2013
All Other Stock Option Awards [Member]
Number of shares authorized under the plan (in shares)   5,000,000   5,000,000   1,500,000   1,500,000   3,500,000                
Remaining shares available for grant under the plan (in shares)   1,479,900   1,479,900           1,092,500                
Contractual life of stock options and other awards under share-based compensation plans       10 years       10 years                    
Options granted (in shares) 2,325,000 325,000 900,000 325,000 900,000 2,000,000 1,225,000 2,000,000 1,225,000   500,000   325,000 1,277,500   337,600    
Restricted stock granted to CEO as settlement for discretionary bonus (in shares)       205,332                            
Restricted stock granted to CEO as settlement for discretionary bonus       $ 0.1                            
Option Vesting Schedule                                    
Vesting percentage, year one           25.00%   25.00%       50.00% 33.00%   33.00%   33.00% 0.00%
Vesting percentage, year two           25.00%   25.00%       50.00% 33.00%   33.00%   33.00% 25.00%
Vesting percentage, year three           25.00%   25.00%         34.00%   34.00%   34.00% 25.00%
Vesting percentage, year four           25.00%   25.00%                   25.00%
Vesting percentage, year five                                   25.00%