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Share-Based Compensation (Stock Option Activity) (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Shares    
Outstanding, beginning of period (in shares) 944,600 873,200
Granted (in shares) 302,700 294,500
Exercised (in shares) (9,300) (32,800)
Forfeited or expired (in shares) (95,900) (72,700)
Outstanding, end of period (in shares) 1,142,100 1,062,200
Exercisable, end of period (in shares) 628,600 599,800
Weighted Average Exercise Price    
Outstanding, beginning of period, weighted-average exercise price (in USD per share) $ 38.45 $ 41.79
Granted, weighted-average exercise price (in USD per share) 30.53 29.46
Exercised, weighted-average exercise price (in USD per share) 29.46 26.81
Forfeited or expired, weighted-average exercise price (in USD per share) 42.62 45.00
Outstanding, end of period, weighted-average exercise price (in USD per share) 36.07 38.61
Exercisable, end of period, weighted-average exercise price (in USD per share) $ 38.70 $ 37.99
Options, Additional Disclosures:    
Outstanding, end of period, weighted-average remaining contractual term 7 years 6 months 7 years 7 months 6 days
Exercisable, end of period, weighted-average remaining contractual term 6 years 6 years 2 months 12 days
Outstanding, end of period, aggregate intrinsic value $ 2,540 $ 6,573
Exercisable, end of period, aggregate intrinsic value $ 2,206 $ 4,054