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Share-Based Compensation Restricted Stock Units Activity) (Details) (Restricted Stock Units (RSUs), USD $)
3 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Restricted Stock Units (RSUs)
   
Shares    
Outstanding, beginning of period 437,500 421,300
Granted 96,600 113,600
Vested and issued (93,700) (27,700)
Forfeited (14,400) (3,600)
Outstanding, end of period 426,000 503,600
Vested, end of period 69,600 83,100
Weighted- Average Grant-Date Fair Value    
Outstanding, beginning of period, weighted-average grant-date fair value (in USD per share) $ 16.76 $ 11.01
Granted, weighted-average grant-date fair value (in USD per share) $ 33.50 $ 29.94
Vested and issued, weighted-average grant-date fair value (in USD per share) $ 15.12 $ 9.03
Forfeited, weighted-average grant-date fair value (in USD per share) $ 20.78 $ 13.24
Outstanding, end of period, weighted-average grant-date fair value (in USD per share) $ 20.78 $ 15.38
Vested, end of period, weighted-average grant-date fair value (in USD per share) $ 9.34 $ 9.63