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Common Stock and Dividends (Details) - USD ($)
1 Months Ended 2 Months Ended
Mar. 02, 2021
Feb. 17, 2021
Apr. 30, 2009
May 03, 2021
Common Stock and Dividends        
Cash dividends paid to common shareholders (in dollars per share)   $ 0.55    
Repurchase of common stock, authorized amount $ 50,000,000   $ 40,000,000  
Period of repurchase of common stock 12 months   12 months  
Cumulative number of shares repurchased under all stock repurchase programs       12,268,401
Cumulative cost of shares repurchased under all stock repurchase programs       $ 357,102,000