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Share-Based Compensation Employee Share-Based Compensation Plans (Details)
3 Months Ended 3 Months Ended 3 Months Ended 1 Months Ended
Mar. 31, 2014
Mar. 31, 2014
2008 Plan [Member]
Mar. 31, 2013
2008 Plan [Member]
Mar. 31, 2014
2011 Plan [Member]
Mar. 31, 2013
2011 Plan [Member]
May 29, 2013
2011 Plan [Member]
Mar. 31, 2014
Awards to Certain Employees [Member]
Mar. 31, 2014
Amended and Restated 2011 Plan [Member]
May 29, 2013
Amended and Restated 2011 Plan [Member]
Sep. 30, 2013
Director Stock Plan [Member]
Mar. 31, 2014
Director Stock Plan [Member]
Dec. 31, 2010
December 2010 Stock Option Award [Member]
Mar. 31, 2014
December 2010 Stock Option Award [Member]
Mar. 31, 2014
All Other Stock Option Awards [Member]
Number of shares authorized under the plan (in shares)   5,000,000       1,500,000     3,500,000   600,000      
Options granted (in shares) 462,600 162,600 0 300,000 0             500,000    
Remaining shares available for grant under the plan (in shares)   3,209,300           1,166,750     360,000      
Contractual life of stock options and other awards under share-based compensation plans   10 years   10 years                    
Option Vesting Schedule                            
Vesting percentage, grant date                     25.00%      
Vesting percentage, year one       25.00%     33.00%       25.00%   50.00% 0.00%
Vesting percentage, year two 33.00%     25.00%             25.00%   50.00% 25.00%
Vesting percentage, year three 33.00%     25.00%             25.00%     25.00%
Vesting percentage, year four       25.00%                   25.00%
Vesting percentage, year five                           25.00%
Aggregate shares granted             1,344,100     2,000,000