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Employee Incentive Plans (2007 Stock Incentive Plan, ROI Summary) (Details)	3 Months Ended
	Mar. 31, 2021 shares
Stock Incentive Plan Granted Shares Adjustment	5,290
2007 Stock Incentive Plan (Shares)
Beginning Balance	4,972,611	[1]
Shares Cancelled	(12,345)
Ending Balance	4,960,266
[1] Stock Incentive Plan number of granted restricted stock units related to 2020 was adjusted by 5,290 additional restricted stock units during the three months ended March 31, 2021.

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Shares granted, net of shares distributed and forfeited.

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