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Earnings Per Share (Computation of basic and diluted earnings per share) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Sep. 30, 2019 | Jun. 30, 2019 | Sep. 30, 2018 | Jun. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Numerator for basic and diluted earnings per share: |  |  |  |  |  |
Net income | $ 16,599 | $ 18,579 | $ 15,912 | $ 7,706 | $ 35,178 | $ 23,618
Denominators: |  |  |  |  |  |
Average basic shares outstanding | 23,631,000 |  | 23,272,000 |  | 23,532,000 | 23,194,000
Effect of dilutive employee stock options and other share-based awards | 295,000 |  | 449,000 |  | 300,000 | 427,000
Average diluted shares outstanding | 23,926,000 |  | 23,721,000 |  | 23,832,000 | 23,621,000

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