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Consolidated Statement of Stockholders Equity - USD ($) $ in Thousands | Total | Directors | Common Stock ($0.01 par value) | Additional Paid-in Capital | Additional Paid-in Capital Directors | Retained Earnings | Accumulated Other Comprehensive Loss
--- | --- | --- | --- | --- | --- | --- | ---
Opening Balance at Mar. 31, 2017 | $ 341,350 |  | $ 226 | $ 258,853 |  | $ 179,735 | $ (97,464)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Net income | 22,065 |  | 0 | 0 |  | 22,065 | 0
Payments of Dividends | (3,903) |  | 0 | 0 |  | 3,903 | 0
Change in foreign currency translation adjustment | 21,717 |  | 0 | 0 |  | 0 | 21,717
Change in net unrealized gain on investments, net of tax | 189 |  | 0 | 0 |  | 0 | 189
Change in derivatives qualifying as hedges, net of tax | 3,563 |  | 0 | 0 |  | 0 | 3,563
Change in pension liability and postretirement obligations, net of tax | 12,737 |  | 0 | 0 |  | 0 | 12,737
Stock compensation - directors | 5,156 | $ 430 | 0 | 5,156 | $ 430 | 0 | 0
Stock Issued During Period, Value, Stock Options Exercised | 6,332 |  | 4 | 6,328 |  | 0 | 0
Restricted stock units released, shares, net of shares withheld for minimum statutory tax obligation | (1,407) |  | 0 | (1,407) |  | 0 | 0
closing balance at Mar. 31, 2018 | 408,229 |  | 230 | 269,360 |  | 197,897 | (59,258)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Net income | 42,577 |  | 0 | 0 |  | 42,577 | 0
Payments of Dividends | (4,903) |  | 0 | 0 |  | 4,903 | 0
Change in foreign currency translation adjustment | (16,708) |  | 0 | 0 |  | 0 | (16,708)
Change in net unrealized gain on investments, net of tax | (883) |  | 0 | 0 |  | 0 | (883)
Change in derivatives qualifying as hedges, net of tax | (1,037) |  | 0 | 0 |  | 0 | (1,037)
Change in pension liability and postretirement obligations, net of tax | (5,166) |  | 0 | 0 |  | 0 | (5,166)
Stock compensation - directors | 5,768 | 430 | 0 | 5,768 | 430 | 0 | 0
Stock Issued During Period, Value, Stock Options Exercised | 4,152 |  | 4 | 4,148 |  | 0 | 0
Tax effect of exercise of stock options | (2,188) |  |  | 2,188 |  |  | 0
closing balance at Mar. 31, 2019 | 431,159 |  | 234 | 277,518 |  | 236,459 | (83,052)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets | Accounting Standards Update 2016-01 [Member] | 888 |  | 0 | 0 |  | 888 | 0
Net income | 59,672 |  | 0 | 0 |  | 59,672 | 0
Payments of Dividends | (5,690) |  |  |  |  |  |
Dividends declared |  |  | 0 | 0 |  | (5,690) | 0
Change in foreign currency translation adjustment | (9,004) |  | 0 | 0 |  | 0 | (9,004)
Change in derivatives qualifying as hedges, net of tax | 1,602 |  | 0 | 0 |  | 0 | 1,602
Change in pension liability and postretirement obligations, net of tax | (23,896) |  | 0 | 0 |  | 0 | (23,896)
Stock compensation - directors | 4,047 | $ 460 | 0 | 4,047 | $ 460 | 0 | 0
Stock Issued During Period, Value, Stock Options Exercised | 6,000 |  | 3 | 5,997 |  | 0 | 0
Tax effect of exercise of stock options |  |  |  |  |  |  | 0
Restricted stock units released, shares, net of shares withheld for minimum statutory tax obligation | (765) |  | 1 | (766) |  | 0 |
closing balance at Mar. 31, 2020 | $ 463,585 |  | $ 238 | $ 287,256 |  | $ 290,441 | $ (114,350)

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