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Net Income Per Common Share - Additional Information (Details) - $ / shares
3 Months Ended 9 Months Ended
Apr. 06, 2020
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Earnings Per Share [Abstract]          
Anti-dilutive securities excluded from computation of earnings per share amount (in shares)   1,500,000 100,000 900,000 100,000
Dividend Declared          
Earnings Per Share [Line Items]          
Dividends payable, date declared Apr. 06, 2020        
Number of preferred share purchase right declared as divided per common stock 1        
Dividends payable,record date Apr. 16, 2020        
Maximum percentage of common stock acquisition allowed by board of directors under rights plan 15.00%        
Number of days after public announcement rights exercisable for acquiring person 10 days        
Rights expiration date Apr. 06, 2021        
Dividend Declared | Series A Junior Participating Preferred Stock          
Earnings Per Share [Line Items]          
Exercise price of rights $ 150.00