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Investments in Equity Securities (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Mar. 31, 2023 | Sep. 30, 2022 | Dec. 31, 2022
Debt Securities, Available-for-sale [Line Items] |  |  |
Equity securities | $ 1,279,955 |  | $ 1,185,894
Fair Value |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Cost | 1,165,984 |  | 1,115,328
Gross Unrealized, Gains | 229,473 | $ 193,218 |
Gross Unrealized, Losses | (115,502) | (122,652) |
Equity securities | 1,279,955 |  | 1,185,894
Fair Value | Common stock |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Cost | 883,234 |  | 855,987
Gross Unrealized, Gains | 227,947 | 192,165 |
Gross Unrealized, Losses | (53,582) | (65,401) |
Equity securities | 1,057,599 |  | 982,751
Fair Value | Preferred stocks |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Cost | 282,750 |  | 259,341
Gross Unrealized, Gains | 1,526 | 1,053 |
Gross Unrealized, Losses | (61,920) | $ (57,251) |
Equity securities | 222,356 |  | 203,143
Carrying Value |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Equity securities | 1,279,955 |  | 1,185,894
Carrying Value | Common stock |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Equity securities | 1,057,599 |  | 982,751
Carrying Value | Preferred stocks |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Equity securities | $ 222,356 |  | $ 203,143

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- Definition Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI), classified as current. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=123594786&loc=SL75136599-209740 + Details
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