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Investments in Equity Securities (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2023	Dec. 31, 2022
Debt Securities, Available-for-sale [Line Items]
Equity securities	$ 1,239,712	$ 1,185,894
Fair Value
Debt Securities, Available-for-sale [Line Items]
Cost	1,104,481	1,115,328
Gross Unrealized, Gains	237,792	193,218
Gross Unrealized, Losses	(102,561)	(122,652)
Equity securities	1,239,712	1,185,894
Fair Value | Common stock
Debt Securities, Available-for-sale [Line Items]
Cost	823,504	855,987
Gross Unrealized, Gains	235,699	192,165
Gross Unrealized, Losses	(44,383)	(65,401)
Equity securities	1,014,820	982,751
Fair Value | Preferred stocks
Debt Securities, Available-for-sale [Line Items]
Cost	280,977	259,341
Gross Unrealized, Gains	2,093	1,053
Gross Unrealized, Losses	(58,178)	(57,251)
Equity securities	224,892	203,143
Carrying Value
Debt Securities, Available-for-sale [Line Items]
Equity securities	1,239,712	1,185,894
Carrying Value | Common stock
Debt Securities, Available-for-sale [Line Items]
Equity securities	1,014,820	982,751
Carrying Value | Preferred stocks
Debt Securities, Available-for-sale [Line Items]
Equity securities	$ 224,892	$ 203,143

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Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI), classified as current.

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