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Earnings Per Share (Computation of Basis and Diluted Earnings Per Share) (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Numerator        
Net income $ 31,641 $ 27,995 $ 58,305 $ 85,971
Denominator        
Denominator for basic earnings per share — weighted average shares outstanding (in shares) 52,999 52,824 52,960 52,727
Dilutive effect of unvested restricted stock units and options issued to employees and directors (in shares) 360 379 379 379
Denominator for diluted earnings per share (in shares) 53,359 53,203 53,339 53,106
Earnings per Common Share:        
Basic net earnings per share (in USD per share) $ 0.60 $ 0.53 $ 1.10 $ 1.63
Diluted net earnings per share (in USD per share) $ 0.59 $ 0.53 $ 1.09 $ 1.62