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(Computation of Basis and Diluted Earnings Per Share) (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Numerator        
Net income $ 32,195 $ 31,803 $ 26,664 $ 57,976
Denominator        
Denominator for basic earnings per share — weighted average shares outstanding (in shares) 52,993 52,803 52,941 52,676
Dilutive effect of unvested restricted stock units and options issued to employees and directors (in shares) 352 348 388 379
Denominator for diluted earnings per share (in shares) 53,345 53,151 53,329 53,055
Earnings per Common Share:        
Basic net earnings per share (in USD per share) $ 0.61 $ 0.60 $ 0.50 $ 1.10
Diluted net earnings per share (in USD per share) $ 0.60 $ 0.60 $ 0.50 $ 1.09