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Share-Based Compensation Stock Option Activity (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Shares    
Outstanding, beginning of period (in shares) 1,114,900 1,020,200
Granted (in shares) 222,700 249,900
Exercised (in shares) (67,900) (60,500)
Forfeited or expired (in shares) (17,600) 0
Outstanding, end of period (in shares) 1,252,100 1,209,600
Exercisable, end of period (in shares) 779,500 701,500
Weighted Average Exercise Price    
Outstanding, beginning of period, weighted-average exercise price (in USD per share) $ 37.92 $ 35.90
Granted, weighted-average exercise price (in USD per share) 44.33 39.98
Exercised, weighted-average exercise price (in USD per share) 32.49 20.10
Forfeited or expired, weighted-average exercise price (in USD per share) 46.09 0
Outstanding, end of period, weighted-average exercise price (in USD per share) 39.24 37.53
Exercisable, end of period, weighted-average exercise price (in USD per share) $ 38.72 $ 39.36
Options, Additional Disclosures:    
Outstanding, end of period, weighted-average remaining contractual term 6 years 10 months 24 days 7 years 3 months 18 days
Exercisable, end of period, weighted-average remaining contractual term 5 years 7 months 6 days 5 years 10 months 24 days
Outstanding, end of period, aggregate intrinsic value $ 17,068 $ 5,770
Exercisable, end of period, aggregate intrinsic value $ 11,399 $ 3,874