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Earnings Per Share - Anti-dilutive Securities Excluded (Details) - shares
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Earnings Per Share [Abstract]        
Stock options and warrants (in shares) 8,119,940 8,408,386 8,119,940 7,124,005