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Earnings Per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]    
Earnings for basic computations $ 91,621 $ 128,686
Earnings for diluted computations $ 91,622 $ 128,689
Dilutive stock options and restricted stock (in shares) 822,375 1,018,990
Earnings per common share    
Basic (in dollars per share) $ 0.68 $ 0.93
Diluted (in dollars per share) $ 0.67 $ 0.92
Unvested shares, cash dividends paid $ 51,641 $ 43,832
Restricted Stock Awards    
Earnings per common share    
Unvested shares participating in the payment of the Company's dividends declared (in shares) 700,000 700,000
Unvested shares, cash dividends paid $ 300 $ 200
Undistributed earnings allocated to participating securities, basic 200 400
Undistributed earnings allocated to participating securities, diluted $ 200 $ 400
Equity Incentive Plan Options    
Earnings per common share    
Antidilutive options excluded from the computation of EPS (in shares) 100,000 200,000
Class A Common Stock    
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]    
Weighted-average common shares outstanding for basic computations (in shares) 135,569,968 138,153,464
Weighted-average common shares outstanding for diluted computations (in shares) 136,392,343 139,172,454