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Consolidated Statements of Changes in Stockholders' Equity - USD ($) $ in Thousands | Total | Common Stock | Additional Paid-in Capital | Treasury Stock | Accumulated Other Comprehensive (Loss) Income | Retained Earnings
--- | --- | --- | --- | --- | --- | ---
Beginning balance, common stock (in shares) at Mar. 31, 2017 |  | 53,287,000 |  |  |  |
Beginning balance, treasury stock (in shares) at Mar. 31, 2017 |  |  |  | 332,000 |  |
Beginning balance at Mar. 31, 2017 | $ 822,549 | $ 533 | $ 458,255 | $ (6,594) | $ (26,352) | $ 396,707
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Stock-based compensation | $ 8,909 |  | 8,909 |  |  |
Exercise of stock options (in shares) | 55,700 | 56,000 |  |  |  |
Exercise of stock options | $ 1,620 | $ 0 | 1,620 |  |  |
Issuance of shares related to restricted stock (in shares) |  | 53,000 |  |  |  |
Issuance of shares related to restricted stock |  | $ 1 | (1) |  |  |
Treasury share repurchases (in shares) |  |  |  | 21,000 |  |
Treasury share repurchases | (1,075) |  |  | $ (1,075) |  |
Net income (loss) | 339,570 |  |  |  |  | 339,570
Other comprehensive income (loss) | 7,037 |  |  |  | 7,037 |
Ending balance, common stock (in shares) at Mar. 31, 2018 |  | 53,396,000 |  |  |  |
Ending balance, treasury stock (in shares) at Mar. 31, 2018 |  |  |  | 353,000 |  |
Ending balance at Mar. 31, 2018 | 1,178,610 | $ 534 | 468,783 | $ (7,669) | (19,315) | 736,277
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Stock-based compensation | $ 7,438 |  | 7,438 |  |  |
Exercise of stock options (in shares) | 97,700 | 98,000 |  |  |  |
Exercise of stock options | $ 2,931 | $ 0 | 2,931 |  |  |
Issuance of shares related to restricted stock (in shares) |  | 176,000 |  |  |  |
Issuance of shares related to restricted stock |  | $ 2 | (2) |  |  |
Treasury share repurchases (in shares) |  |  |  | 1,518,000 |  |
Treasury share repurchases | (52,259) |  |  | $ (52,259) |  |
Net income (loss) | (35,800) |  |  |  |  | (35,800)
Other comprehensive income (loss) | $ (6,432) |  |  |  | (6,432) |
Ending balance, common stock (in shares) at Mar. 31, 2019 |  | 53,670,000 |  |  |  |
Ending balance, treasury stock (in shares) at Mar. 31, 2019 | 1,871,000 |  |  | 1,871,000 |  |
Ending balance at Mar. 31, 2019 | $ 1,095,831 | $ 536 | 479,150 | $ (59,928) | (25,747) | 701,820
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Stock-based compensation | $ 7,644 |  | 7,644 |  |  |
Exercise of stock options (in shares) | 47,900 | 48,000 |  |  |  |
Exercise of stock options | $ 1,324 | $ 1 | 1,323 |  |  |
Issuance of shares related to restricted stock (in shares) |  | 87,000 |  |  |  |
Issuance of shares related to restricted stock |  | $ 1 | (1) |  |  |
Treasury share repurchases (in shares) |  |  |  | 1,848,000 |  |
Treasury share repurchases | (57,695) |  |  | $ (57,695) |  |
Net income (loss) | 142,281 |  |  |  |  | 142,281
Other comprehensive income (loss) | $ (18,414) |  |  |  | (18,414) |
Ending balance, common stock (in shares) at Mar. 31, 2020 |  | 53,805,000 |  |  |  |
Ending balance, treasury stock (in shares) at Mar. 31, 2020 | 3,719,000 |  |  | 3,719,000 |  |
Ending balance at Mar. 31, 2020 | $ 1,170,971 | $ 538 | $ 488,116 | $ (117,623) | $ (44,161) | $ 844,101

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