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Consolidated Statements of Changes in Stockholders' Equity and Comprehensive Income - USD ($) $ in Thousands | Total | Common Stock | Additional Paid-in Capital | Treasury Stock | Accumulated Other Comprehensive (Loss) Income | Preferred Share Rights | Retained Earnings (Accumulated Deficit)
--- | --- | --- | --- | --- | --- | --- | ---
Balances at Mar. 31, 2013 | $ 477,943 | $ 513 | $ 401,691 | $ (687) | $ (104) | $ 283 | $ 76,247
Common stock, shares at Mar. 31, 2013 |  | 51,311,000 |  |  |  |  |
Treasury stock, shares at Mar. 31, 2013 |  |  |  | 181,000 |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Stock-based compensation | 5,146 |  | 5,146 |  |  |  |
Exercise of stock options | $ 5,907 | $ 6 | 5,901 |  |  |  |
Exercise of stock options, shares | 605,000 | 605,000 |  |  |  |  |
Preferred share rights | $ 0 |  |  |  |  | (283) | 283
Issuance of shares related to restricted stock |  | $ 1 | (1) |  |  |  |
Issuance of shares related to restricted stock, shares |  | 105,000 |  |  |  |  |
Treasury share repurchases | (744) |  |  | $ (744) |  |  |
Treasury share repurchases, shares |  |  |  | 25,000 |  |  |
Excess tax benefits from share-based awards | 1,650 |  | 1,650 |  |  |  |
Components of comprehensive income: |  |  |  |  |  |  |
Net income | 72,615 |  |  |  |  |  | 72,615
Translation adjustments | 843 |  |  |  | 843 |  |
Comprehensive income | 73,458 |  |  |  |  |  |
Balances at Mar. 31, 2014 | 563,360 | $ 520 | 414,387 | $ (1,431) | 739 | 0 | 149,145
Common stock, shares at Mar. 31, 2014 |  | 52,021,000 |  |  |  |  |
Treasury stock, shares at Mar. 31, 2014 |  |  |  | 206,000 |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Stock-based compensation | 6,918 |  | 6,918 |  |  |  |
Exercise of stock options | $ 3,954 | $ 4 | 3,950 |  |  |  |
Exercise of stock options, shares | 386,300 | 387,000 |  |  |  |  |
Issuance of shares related to restricted stock | $ 0 | $ 1 | (1) |  |  |  |
Issuance of shares related to restricted stock, shares |  | 154,000 |  |  |  |  |
Treasury share repurchases | (2,047) |  |  | $ (2,047) |  |  |
Treasury share repurchases, shares |  |  |  | 60,000 |  |  |
Excess tax benefits from share-based awards | 1,330 |  | 1,330 |  |  |  |
Components of comprehensive income: |  |  |  |  |  |  |
Net income | 78,260 |  |  |  |  |  | 78,260
Translation adjustments | (24,151) |  |  |  | (24,151) |  |
Comprehensive income | 54,109 |  |  |  |  |  |
Balances at Mar. 31, 2015 | $ 627,624 | $ 525 | 426,584 | $ (3,478) | (23,412) | 0 | 227,405
Common stock, shares at Mar. 31, 2015 |  | 52,562,000 |  |  |  |  |
Treasury stock, shares at Mar. 31, 2015 | 266,000 |  |  | 266,000 |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Stock-based compensation | $ 9,954 |  | 9,954 |  |  |  |
Exercise of stock options | $ 6,688 | $ 3 | 6,685 |  |  |  |
Exercise of stock options, shares | 348,000 | 348,000 |  |  |  |  |
Issuance of shares related to restricted stock | $ 1 | $ 2 | (1) |  |  |  |
Issuance of shares related to restricted stock, shares |  | 156,000 |  |  |  |  |
Treasury share repurchases | (1,685) |  |  | $ (1,685) |  |  |
Treasury share repurchases, shares |  |  |  | 40,000 |  |  |
Excess tax benefits from share-based awards | 1,960 |  | 1,960 |  |  |  |
Components of comprehensive income: |  |  |  |  |  |  |
Net income | 99,907 |  |  |  |  |  | 99,907
Translation adjustments | (113) |  |  |  | (113) |  |
Comprehensive income | 99,794 |  |  |  |  |  |
Balances at Mar. 31, 2016 | $ 744,336 | $ 530 | $ 445,182 | $ (5,163) | $ (23,525) | $ 0 | $ 327,312
Common stock, shares at Mar. 31, 2016 |  | 53,066,000 |  |  |  |  |
Treasury stock, shares at Mar. 31, 2016 | 306,000 |  |  | 306,000 |  |  |

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