Quarterly report pursuant to Section 13 or 15(d)

Stock-Based Compensation (Schedule of Stock-based Awards Granted) (Details)

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Stock-Based Compensation (Schedule of Stock-based Awards Granted) (Details) - 2007 Stock Incentive Plan - shares
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Stock options    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Options granted (in shares) 0 0
Restricted stock awards and restricted stock units    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Equity instruments other than options, granted (in shares) 98,500 53,600
Performance stock units    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Equity instruments other than options, granted (in shares) 163,640 0