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Earnings Per Share - Anti-dilutive Securities Excluded (Details) - shares
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Earnings Per Share [Abstract]        
Stock options and warrants (in shares) 8,083,690 8,469,440 8,083,690 8,419,375