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Earnings Per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]    
Earnings for basic computations $ 128,686 $ 116,766
Earnings for diluted computations $ 128,689 $ 116,770
Dilutive stock options and restricted stock (in shares) 1,018,990 1,124,674
Earnings per common share    
Basic (in dollars per share) $ 0.93 $ 0.83
Diluted (in dollars per share) $ 0.92 $ 0.83
Unvested shares, cash dividends paid $ 43,832 $ 32,412
Restricted stock    
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 $ 200 $ 200
Undistributed earnings allocated to participating securities, basic 400 400
Undistributed earnings allocated to participating securities, diluted $ 400 $ 400
Stock options    
Earnings per common share    
Antidilutive options excluded from the computation of EPS (in shares) 200,000 100,000
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) 138,153,464 140,004,627
Weighted-average common shares outstanding for diluted computations (in shares) 139,172,454 141,129,301