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Consolidated Statement of Stockholders Equity (Parenthetical) - USD ($) $ in Thousands | 12 Months Ended
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Mar. 31, 2020 | Mar. 31, 2019 | Mar. 31, 2018
Common Stock ($.01 par value) | $ 0.01 | $ 0.01 | $ 0.01
Change in net unrealized gain on investments, tax | $ 0 | $ 0 | $ (124)
Change in pension liability and postretirement obligations, tax | $ 8,010 | $ 2,097 | $ (5,205)
Stock options exercised, shares | 296,027 | 187,907 | 363,091
Change in derivatives qualifying as hedges, tax | $ (565) | $ 469 | $ (1,519)
Restricted stock units released, net of shares withheld for minimum statutory tax obligation | 82,861 | 157,715 | 116,775

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- Definition Amount of tax expense (benefit), after reclassification adjustments, of appreciation (loss) in value of unsold available-for-sale securities. Excludes amounts related to other than temporary impairment (OTTI) loss. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=118930883&loc=SL7669646-108580 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=118930883&loc=SL7669646-108580 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=118930883&loc=d3e640-108580 + Details
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