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Share-Based Compensation (Stock Option Activity) (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Shares    
Outstanding, beginning of period (in shares) 772,300 727,700
Granted (in shares) 182,800 224,800
Exercised (in shares) (13,800) (105,700)
Forfeited or expired (in shares) (5,800) (45,500)
Outstanding, end of period (in shares) 935,500 801,300
Exercisable, end of period (in shares) 527,300 386,400
Weighted- Average Exercise Price    
Outstanding, beginning of period, weighted-average exercise price (in USD per share) $ 37.70 $ 30.70
Granted, weighted-average exercise price (in USD per share) 56.11 57.18
Exercised, weighted-average exercise price (in USD per share) 31.35 32.20
Forfeited or expired, weighted-average exercise price (in USD per share) 32.64 37.34
Outstanding, end of period, weighted-average exercise price (in USD per share) 41.42 37.55
Exercisable, end of period, weighted-average exercise price (in USD per share) $ 31.95 $ 25.20
Options, Additional Disclosures:    
Outstanding, end of period, weighted-average remaining contractual term 7 years 7 months 30 days 8 years
Exercisable, end of period, weighted-average remaining contractual term 6 years 5 months 18 days 6 years 8 months 12 days
Outstanding, end of period, aggregate intrinsic value $ 12,123 $ 14,700
Exercisable, end of period, aggregate intrinsic value $ 11,305 $ 11,669