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Common Stock Equivalents (Details) - shares
shares in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Earnings Per Share [Abstract]        
Weighted Average Number of Shares Outstanding, Basic 539,000 526,000 539,000 526,000
Diluted (in shares) 539,000 528,000 539,000 527,000
Dilutive Effect of Contingently Issuable Shares 300 1,600 300 1,000