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Share-Based Compensation Employee Share-Based Compensation Plans (Details)
6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 1 Months Ended
Jun. 30, 2014
Jun. 30, 2014
2008 Plan [Member]
Jun. 30, 2013
2008 Plan [Member]
Jun. 30, 2014
2008 Plan [Member]
Jun. 30, 2013
2008 Plan [Member]
Jun. 30, 2014
2011 Plan [Member]
Sep. 30, 2013
2011 Plan [Member]
Jun. 30, 2014
2011 Plan [Member]
Jun. 30, 2013
2011 Plan [Member]
Jun. 30, 2014
Awards to Certain Employees [Member]
Jun. 30, 2014
Amended and Restated 2011 Plan [Member]
Sep. 30, 2013
Director Stock Plan [Member]
Jun. 30, 2014
Director Stock Plan [Member]
Dec. 31, 2010
December 2010 Stock Option Award [Member]
Jun. 30, 2014
December 2010 Stock Option Award [Member]
Jun. 30, 2014
All Other Stock Option Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award                                
Number of shares authorized under the plan (in shares)   5,000,000   5,000,000             3,500,000   600,000      
Options granted (in shares) 643,700 181,100 0 343,700 0 0   300,000 0         100,000    
Remaining shares available for grant under the plan (in shares)   3,127,900   3,127,900             1,217,000   360,000      
Contractual life of stock options and other awards under share-based compensation plans       10 years       10 years                
Aggregate shares granted             400,000     1,228,900   2,000,000        
Option Vesting Schedule                                
Vesting percentage, grant date                         25.00%      
Vesting percentage, year one           25.00%   25.00%   33.00%     25.00%   50.00% 0.00%
Vesting percentage, year two           25.00%   25.00%   33.00%     25.00%   50.00% 25.00%
Vesting percentage, year three           25.00%   25.00%   33.00%     25.00%     25.00%
Vesting percentage, year four           25.00%   25.00%               25.00%
Vesting percentage, year five                               25.00%