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Employee Incentive Plans (2007 Stock Incentive Plan, ROI Summary) (Details)
 6 Months Ended
Jun. 30, 2020
shares
Stock Incentive Plan Granted Shares Adjustment 343
2007 Stock Incentive Plan (Shares)  
Beginning Balance 5,127,915 [1]
Shares Cancelled (67,507)
Shares Distributed (1,298,027)
Ending Balance 3,762,381
[1] Stock Incentive Plan number of granted restricted stock units related to 2019 was adjusted by 343 additional restricted stock units during the six months ended June 30, 2020.