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Employee Incentive Plans (2007 Stock Incentive Plan, ROI Summary) (Details)
 6 Months Ended
Jun. 30, 2021
shares
Stock Incentive Plan Granted Shares Adjustment 7,034
2007 Stock Incentive Plan (Shares)  
Beginning Balance 4,974,355 [1]
Shares Granted
Shares Cancelled (23,563)
Shares Distributed (1,210,929)
Ending Balance 3,739,863
[1] Stock Incentive Plan number of granted restricted stock units related to 2020 was adjusted by 7,034 additional restricted stock units during the six months ended June 30, 2021.