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Earnings Per Share (Computation of basic and diluted earnings per share) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Dec. 31, 2019 | Dec. 31, 2018
Numerator for basic and diluted earnings per share: |  |  |  |  |  |  |  |
Net income (loss) | $ 15,250 | $ 16,599 | $ 18,579 | $ (782) | $ 15,912 | $ 7,706 | $ 50,428 | $ 22,836
Denominators: |  |  |  |  |  |  |  |
Average basic shares outstanding | 23,679,000 |  |  | 23,348,000 |  |  | 23,581,000 | 23,245,000
Effect of dilutive employee stock options and other share-based awards | 352,000 |  |  | 0 |  |  | 344,000 | 402,000
Average diluted shares outstanding | 24,031,000 |  |  | 23,348,000 |  |  | 23,925,000 | 23,647,000

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