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Accumulated other comprehensive income (loss) components of net of tax (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Jun. 30, 2021 | Jun. 30, 2020
Accumulated Other Comprehensive Income (Loss) Components, Net of Tax [Roll Forward] |  |
Balance as of March 31, 2021 | $ 106,857 |
Foreign currency translation | (3,392) | $ (2,917)
Unrealized net gain on investments | (73,027) | (45,499)
Change in fair value of cash flow hedges | (51) | (532)
Amounts reclassified into earnings on hedging activities | 745 | 564
Other comprehensive income (loss) | (75,725) | (48,384)
Balance as of June 30, 2021 | 31,132 |
Foreign Currency Translation [Member] |  |
Accumulated Other Comprehensive Income (Loss) Components, Net of Tax [Roll Forward] |  |
Balance as of March 31, 2021 | (52,929) |
Foreign currency translation | (3,392) |
Unrealized net gain on investments | 0 |
Change in fair value of cash flow hedges | 0 |
Amounts reclassified into earnings on hedging activities | 0 |
Other comprehensive income (loss) | (3,392) |
Balance as of June 30, 2021 | (56,321) |
Unrealized Net Gain on Investments [Member] |  |
Accumulated Other Comprehensive Income (Loss) Components, Net of Tax [Roll Forward] |  |
Balance as of March 31, 2021 | 167,653 |
Foreign currency translation | 0 |
Unrealized net gain on investments | (73,027) |
Change in fair value of cash flow hedges | 0 |
Amounts reclassified into earnings on hedging activities | 0 |
Other comprehensive income (loss) | (73,027) |
Balance as of June 30, 2021 | 94,626 |
Fair Market Value of Cash Flow Hedges [Member] |  |
Accumulated Other Comprehensive Income (Loss) Components, Net of Tax [Roll Forward] |  |
Balance as of March 31, 2021 | (3,879) |
Foreign currency translation | 0 |
Unrealized net gain on investments | 0 |
Change in fair value of cash flow hedges | (51) |
Amounts reclassified into earnings on hedging activities | 745 |
Other comprehensive income (loss) | 694 |
Balance as of June 30, 2021 | (3,185) |
Postretirement Benefit Obligation Gain [Member] |  |
Accumulated Other Comprehensive Income (Loss) Components, Net of Tax [Roll Forward] |  |
Balance as of March 31, 2021 | (3,988) |
Foreign currency translation | 0 |
Unrealized net gain on investments | 0 |
Change in fair value of cash flow hedges | 0 |
Amounts reclassified into earnings on hedging activities | 0 |
Other comprehensive income (loss) | 0 |
Balance as of June 30, 2021 | (3,988) |
Accumulated Other Comprehensive Income (Loss) [Member] |  |
Accumulated Other Comprehensive Income (Loss) Components, Net of Tax [Roll Forward] |  |
Balance as of March 31, 2021 | 106,857 |
Foreign currency translation | (3,392) | (2,917)
Unrealized net gain on investments | (73,027) | (45,499)
Change in fair value of cash flow hedges | (51) | (532)
Amounts reclassified into earnings on hedging activities | 745 | $ 564
Other comprehensive income (loss) | (75,725) |
Balance as of June 30, 2021 | $ 31,132 |

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