Share-Based Compensation (Stock Option Activity) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Shares
Outstanding, beginning of period (in shares)	1,020,200	944,600
Granted (in shares)	249,900	302,700
Exercised (in shares)	(60,500)	(9,300)
Forfeited or expired (in shares)	0	(95,900)
Outstanding, end of period (in shares)	1,209,600	1,142,100
Exercisable, end of period (in shares)	701,500	628,600
Weighted Average Exercise Price
Outstanding, beginning of period, weighted-average exercise price (in USD per share)	$ 35.90	$ 38.45
Granted, weighted-average exercise price (in USD per share)	39.98	30.53
Exercised, weighted-average exercise price (in USD per share)	20.10	29.46
Forfeited or expired, weighted-average exercise price (in USD per share)	0	42.62
Outstanding, end of period, weighted-average exercise price (in USD per share)	37.53	36.07
Exercisable, end of period, weighted-average exercise price (in USD per share)	$ 39.36	$ 38.70
Options, Additional Disclosures:
Outstanding, end of period, weighted-average remaining contractual term	7 years 3 months 18 days	7 years 6 months
Exercisable, end of period, weighted-average remaining contractual term	5 years 10 months 24 days	6 years
Outstanding, end of period, aggregate intrinsic value	$ 5,770	$ 2,540
Exercisable, end of period, aggregate intrinsic value	$ 3,874	$ 2,206