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Stock-Based Compensation Narrative (Details)
shares in Thousands
3 Months Ended
Mar. 31, 2021
shares
Directors' Plan [Member]  
Statement [Line Items]  
Shares reserved for future grants under the stock option and compensation plan 176
Employee Equity Plan [Member]  
Statement [Line Items]  
Awards vesting period (in years) 3 years
Shares reserved for future grants under the stock option and compensation plan 9,300