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Consolidated Statement of Stockholders Equity - USD ($) | Total | Unrealized Investment Gain | Directors | Common Stock ($0.01 par value) | Common Stock ($0.01 par value) Directors | Additional Paid-in Capital | Additional Paid-in Capital Directors | Retained Earnings | Retained Earnings Directors | Accumulated Other Comprehensive Loss | Accumulated Other Comprehensive Loss Directors
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Opening Balance at Mar. 31, 2018 | $ 408,229,000 |  |  | $ 230,000 |  | $ 269,360,000 |  | $ 197,897,000 |  | $ (59,258,000) |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Net income | 42,577,000 |  |  | 0 |  | 0 |  | 42,577,000 |  | 0 |
Payments of Dividends | (4,903,000) |  |  | 0 |  | 0 |  | 4,903,000 |  | 0 |
Change in foreign currency translation adjustment | (16,708,000) |  |  | 0 |  | 0 |  | 0 |  | (16,708,000) |
Change in net unrealized gain on investments, net of tax | (883,000) |  |  | 0 |  | 0 |  | 0 |  | (883,000) |
Change in derivatives qualifying as hedges, net of tax | (1,037,000) |  |  | 0 |  | 0 |  | 0 |  | (1,037,000) |
Change in pension liability and postretirement obligations, net of tax | (5,166,000) |  |  | 0 |  | 0 |  | 0 |  | (5,166,000) |
Stock compensation - directors | 5,768,000 |  | $ 430,000 | 0 | $ 0 | 5,768,000 | $ 430,000 | 0 | $ 0 | 0 | $ 0
Stock Issued During Period, Value, Stock Options Exercised | 4,152,000 |  |  | 4,000 |  | 4,148,000 |  | 0 |  | 0 |
Restricted stock units released, shares, net of shares withheld for minimum statutory tax obligation | (2,188,000) |  |  | 0 |  | (2,188,000) |  | 0 |  | 0 |
closing balance at Mar. 31, 2019 | 431,159,000 |  |  | 234,000 |  | 277,518,000 |  | 236,459,000 |  | (83,052,000) |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Change in derivatives qualifying as hedges, tax | 469,000 |  |  |  |  |  |  |  |  |  |
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, Tax | $ 2,097,000 |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period | 187,907 |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures | 157,715 |  |  |  |  |  |  |  |  |  |
Comprehensive Income Loss Reclassification |  | $ 0 |  |  |  |  |  |  |  |  |
Comprehensive Income Loss Reclassification | Accounting Standards Update 2016-01 [Member] | $ 888,000 | (888,000) |  |  |  |  |  | 888,000 |  |  |
Net income | 59,672,000 |  |  | 0 |  | 0 |  | 59,672,000 |  | 0 |
Payments of Dividends | (5,690,000) |  |  | 0 |  | 0 |  | 5,690,000 |  | 0 |
Change in foreign currency translation adjustment | (9,004,000) |  |  | 0 |  | 0 |  | 0 |  | (9,004,000) |
Change in derivatives qualifying as hedges, net of tax | 1,602,000 |  |  | 0 |  | 0 |  | 0 |  | 1,602,000 |
Change in pension liability and postretirement obligations, net of tax | (23,896,000) |  |  | 0 |  | 0 |  | 0 |  | (23,896,000) |
Stock compensation - directors | 4,047,000 |  | 460,000 | 0 | 0 | 4,047,000 | 460,000 | 0 | 0 | 0 | 0
Stock Issued During Period, Value, Stock Options Exercised | 6,000,000 |  |  | 3,000 |  | 5,997,000 |  | 0 |  | 0 |
Restricted stock units released, shares, net of shares withheld for minimum statutory tax obligation | (765,000) |  |  | 1,000 |  | (766,000) |  | 0 |  | 0 |
closing balance at Mar. 31, 2020 | 463,585,000 |  |  | 238,000 |  | 287,256,000 |  | 290,441,000 |  | (114,350,000) |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Change in derivatives qualifying as hedges, tax | (565,000) |  |  |  |  |  |  |  |  |  |
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, Tax | $ 8,010,000 |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period | 296,027 |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures | 82,861 |  |  |  |  |  |  |  |  |  |
Comprehensive Income Loss Reclassification | $ 1,617,000 | 0 |  |  |  |  |  |  |  |  |
Comprehensive Income Loss Reclassification | Accounting Standards Update 2016-01 [Member] |  | 0 |  |  |  |  |  |  |  |  |
Net income | 9,106,000 |  |  | 0 |  | 0 |  | 9,106,000 |  | 0 |
Payments of Dividends | (5,745,000) |  |  |  |  |  |  |  |  |  |
Dividends declared |  |  |  | 0 |  | 0 |  | (5,745,000) |  | 0 |
Change in foreign currency translation adjustment | 12,583,000 |  |  | 0 |  | 0 |  | 0 |  | 12,583,000 |
Change in derivatives qualifying as hedges, net of tax | 96,000 |  |  | 0 |  | 0 |  | 0 |  | 96,000 |
Change in pension liability and postretirement obligations, net of tax | 41,685,000 |  |  | 0 |  | 0 |  | 0 |  | 41,685,000 |
Stock compensation - directors | 7,482,000 |  | $ 540,000 | 0 | $ 0 | 7,482,000 | $ 540,000 | 0 | $ 0 | 0 | $ 0
Stock Issued During Period, Value, Stock Options Exercised | 1,973,000 |  |  | 2,000 |  | 1,971,000 |  | 0 |  | 0 |
Tax effect of exercise of stock options |  |  |  |  |  |  |  |  |  | 0 |
Restricted stock units released, shares, net of shares withheld for minimum statutory tax obligation | (1,156,000) |  |  |  |  | (1,156,000) |  | 0 |  |  |
closing balance at Mar. 31, 2021 | 530,149,000 |  |  | $ 240,000 |  | $ 296,093,000 |  | $ 293,802,000 |  | $ (59,986,000) |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Change in derivatives qualifying as hedges, tax | (8,000) |  |  |  |  |  |  |  |  |  |
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, Tax | $ (13,297,000) |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period | 97,398 |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures | 115,281 |  |  |  |  |  |  |  |  |  |
Comprehensive Income Loss Reclassification | $ (25,334,000) | $ 0 |  |  |  |  |  |  |  |  |

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