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Investments in Equity Securities (Investments in Equity Securities Available for Sale) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021
Fair Value |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cost | $ 1,115,328 | $ 870,045
Gross unrealized gains | 193,218 | 100,275
Gross unrealized losses | (122,652) | (29,077)
Equity securities | 1,185,894 | 941,243
Fair Value | Common stocks |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cost | 855,987 | 619,896
Gross unrealized gains | 192,165 | 92,401
Gross unrealized losses | (65,401) | (16,894)
Equity securities | 982,751 | 695,403
Fair Value | Preferred stocks |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cost | 259,341 | 250,149
Gross unrealized gains | 1,053 | 7,874
Gross unrealized losses | (57,251) | (12,183)
Equity securities | 203,143 | 245,840
Carrying Value |  |
Debt Securities, Available-for-sale [Line Items] |  |
Equity securities | 1,185,894 | 941,243
Carrying Value | Common stocks |  |
Debt Securities, Available-for-sale [Line Items] |  |
Equity securities | 982,751 | 695,403
Carrying Value | Preferred stocks |  |
Debt Securities, Available-for-sale [Line Items] |  |
Equity securities | $ 203,143 | $ 245,840

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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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- Definition Amount of unrealized gain on investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 321 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=123583765&loc=SL75117546-209714 + Details
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