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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

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