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Stock Plans (Narrative) (Details)
$ in Millions
3 Months Ended
Mar. 31, 2021
USD ($)
ShareBasedCompensationPlan
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Number of stock-based compensation plan under which grants were made | ShareBasedCompensationPlan 4
EIP Plans [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Shares available for grant under the plan (in shares) 3,754,000
Shares authorized for grant under the plans (in shares) 5,667,000
Minimum [Member] | Restricted Stock [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Remaining unrecognized compensation cost associated with unvested restricted stock awards | $ $ 1
Weighted average period over which unvested restricted stock awards unrecognized compensation cost is expected to be recognized (in years) 1 year