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 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
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) 253,802 0 352,302 53,600
Performance stock units        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Equity instruments other than options, granted (in shares) 140,060 0 303,700 0