Quarterly report pursuant to Section 13 or 15(d)

Net Income (Loss) Per Share (Narrative) (Details)

v3.21.1
Net Income (Loss) Per Share (Narrative) (Details) - shares
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Stock Compensation Plan [Member]    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Dilutive effect of outstanding stock options and shares associated with long-term incentive compensation plans 0 179,709
Employee Stock Option [Member]    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Dilutive effect of outstanding stock options and shares associated with long-term incentive compensation plans 0  
Shares not included in the computation of diluted earnings per share 485,108 632,114
Performance Units [Member]    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Shares not included in the computation of diluted earnings per share 0 117,688