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Consolidated Statements of Stockholders' Equity (unaudited) - USD ($) $ in Thousands | Total | Cumulative Effect, Period of Adoption, Adjustment | Sale of business [Member] | Common Stock [Member] | Capital in Excess of Par Value [Member] | Retained Earnings [Member] | Retained Earnings [Member] Cumulative Effect, Period of Adoption, Adjustment | Accumulated Other Comprehensive Losses [Member] | Accumulated Other Comprehensive Losses [Member] Sale of business [Member]
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Beginning balance at Mar. 31, 2019 | $ 1,209,487 | $ (636) |  | $ 451 |  | $ 1,212,352 | $ (636) | $ (3,316) |
Net Earnings (Loss) | 41,304 |  |  |  |  | 41,304 |  |  |
Stock Option Exercises and Restricted Share Vesting | 396 |  |  |  | $ 396 |  |  |  |
Purchase and Retirement of Common Stock | (198,355) |  |  | (23) | (7,748) | (190,584) |  |  |
Dividends to Stockholders | (4,316) |  |  |  |  | (4,316) |  |  |
Stock Compensation Expense | 8,219 |  |  | 1 | 8,218 |  |  |  |
Shares Redeemed to Settle Employee Taxes | (866) |  |  |  | (866) |  |  |  |
Unfunded Pension Liability, net of tax | 33 |  |  |  |  |  |  | 33 |
Ending Balance at Jun. 30, 2019 | 1,055,266 |  |  | 429 |  | 1,058,120 |  | (3,283) |
Beginning balance at Mar. 31, 2019 | 1,209,487 | $ (636) |  | 451 |  | 1,212,352 | $ (636) | (3,316) |
Net Earnings (Loss) | (1,535) |  |  |  |  |  |  |  |
Ending Balance at Dec. 31, 2019 | 897,327 |  |  | 416 | 8,325 | 891,801 |  | (3,215) |
Beginning balance at Jun. 30, 2019 | 1,055,266 |  |  | 429 |  | 1,058,120 |  | (3,283) |
Net Earnings (Loss) | 71,793 |  |  |  |  | 71,793 |  |  |
Stock Option Exercises and Restricted Share Vesting | 1,371 |  |  |  | 1,371 |  |  |  |
Purchase and Retirement of Common Stock | (115,532) |  |  | (13) | (366) | (115,153) |  |  |
Dividends to Stockholders | (4,163) |  |  |  |  | (4,163) |  |  |
Stock Compensation Expense | 3,918 |  |  |  | 3,918 |  |  |  |
Shares Redeemed to Settle Employee Taxes | (1,933) |  |  |  | (1,933) |  |  |  |
Unfunded Pension Liability, net of tax | 35 |  |  |  |  |  |  | 35 |
Ending Balance at Sep. 30, 2019 | 1,010,755 |  |  | 416 | 2,990 | 1,010,597 |  | (3,248) |
Net Earnings (Loss) | (114,632) |  |  |  |  | (114,632) |  |  |
Stock Option Exercises and Restricted Share Vesting | 1,229 |  |  |  | 1,229 |  |  |  |
Dividends to Stockholders | (4,164) |  |  |  |  | (4,164) |  |  |
Stock Compensation Expense | 4,270 |  |  |  | 4,270 |  |  |  |
Shares Redeemed to Settle Employee Taxes | (164) |  |  |  | (164) |  |  |  |
Unfunded Pension Liability, net of tax | 33 |  |  |  |  |  |  | 33 |
Ending Balance at Dec. 31, 2019 | 897,327 |  |  | 416 | 8,325 | 891,801 |  | (3,215) |
Beginning balance at Mar. 31, 2020 | 967,843 |  |  | 416 | 10,943 | 960,065 |  | (3,581) |
Net Earnings (Loss) | 96,206 |  |  |  |  | 96,206 |  |  |
Stock Compensation Expense | 4,760 |  |  | 2 | 4,758 |  |  |  |
Shares Redeemed to Settle Employee Taxes | (1,130) |  |  |  | (1,130) |  |  |  |
Unfunded Pension Liability, net of tax | 25 |  | $ 254 |  |  |  |  | 25 | $ 254
Ending Balance at Jun. 30, 2020 | 1,067,958 |  |  | 418 | 14,571 | 1,056,271 |  | (3,302) |
Beginning balance at Mar. 31, 2020 | 967,843 |  |  | 416 | 10,943 | 960,065 |  | (3,581) |
Net Earnings (Loss) | 273,433 |  |  |  |  |  |  |  |
Ending Balance at Dec. 31, 2020 | 1,261,182 |  |  | 419 | 30,516 | 1,233,498 |  | (3,251) |
Beginning balance at Jun. 30, 2020 | 1,067,958 |  |  | 418 | 14,571 | 1,056,271 |  | (3,302) |
Net Earnings (Loss) | 96,034 |  |  |  |  | 96,034 |  |  |
Stock Compensation Expense | 3,515 |  |  |  | 3,515 |  |  |  |
Stock Option Exercises and Restricted Share Vesting | 498 |  |  |  | 498 |  |  |  |
Unfunded Pension Liability, net of tax |  |  | 26 |  |  |  |  |  | 26
Ending Balance at Sep. 30, 2020 | 1,168,031 |  |  | 418 | 18,584 | 1,152,305 |  | (3,276) |
Net Earnings (Loss) | 81,193 |  |  |  |  | 81,193 |  |  |
Stock Compensation Expense | 3,782 |  |  |  | 3,782 |  |  |  |
Stock Option Exercises and Restricted Share Vesting | 8,151 |  |  | 1 | 8,150 |  |  |  |
Unfunded Pension Liability, net of tax |  |  | $ 25 |  |  |  |  |  | $ 25
Ending Balance at Dec. 31, 2020 | $ 1,261,182 |  |  | $ 419 | $ 30,516 | $ 1,233,498 |  | $ (3,251) |

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