Share-Based Compensation (Stock Option Activity) (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Jun. 30, 2014	Jun. 30, 2013
Shares
Outstanding, beginning of period (in shares)	994,900	1,386,400
Granted (in shares)	307,500	227,700
Exercised (in shares)	(93,800)	(25,000)
Forfeited or expired (in shares)	(31,600)	(8,000)
Outstanding, end of period (in shares)	1,177,000	1,581,100
Exercisable, end of period (in shares)	375,100	515,900
Weighted- Average Exercise Price
Outstanding, beginning of period, weighted-average exercise price (in USD per share)	$ 15.24	$ 10.43
Granted, weighted-average exercise price (in USD per share)	$ 33.50	$ 29.94
Exercised, weighted-average exercise price (in USD per share)	$ 13.80	$ 12.40
Forfeited or expired, weighted-average exercise price (in USD per share)	$ 25.49	$ 13.24
Outstanding, end of period, weighted-average exercise price (in USD per share)	$ 19.85	$ 13.19
Exercisable, end of period, weighted-average exercise price (in USD per share)	$ 15.23	$ 11.27
Options, Additional Disclosures:
Outstanding, end of period, weighted-average remaining contractual term	7 years 9 months 18 days	6 years 2 months 30 days
Exercisable, end of period, weighted-average remaining contractual term	7 years 3 months 18 days	6 years 11 months 100 days
Outstanding, end of period, aggregate intrinsic value	$ 16,527	$ 9,840
Exercisable, end of period, aggregate intrinsic value	$ 6,998	$ 3,715