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Fair Value of Financial Instruments (Carrying Amounts and Estimated Fair Values of Financial Instruments) (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Assets:
Equity securities	$ 1,155,326	$ 941,243
Arbitrage trading account	1,142,000	1,180,000
Loans receivable	112,072	116,534
Liabilities:
Trading account payable to brokers and clearing organizations	0	53,636
Carrying Value
Assets:
Fixed maturity securities	16,851,514	16,602,673
Equity securities	1,155,326	941,243
Arbitrage trading account	1,142,003	1,179,606
Loans receivable	113,483	115,172
Cash and cash equivalents	1,316,603	1,568,843
Trading account receivables from brokers and clearing organizations	9,937	0
Due from broker	0	20,448
Liabilities:
Due to broker	49,178	0
Trading account payable to brokers and clearing organizations	0	53,636
Trading account securities sold but not yet purchased	68	1,169
Senior notes and other debt	1,832,273	2,259,416
Subordinated debentures	1,008,011	1,007,652
Fair Value
Assets:
Fixed maturity securities	16,857,031	16,614,118
Equity securities	1,155,326	941,243
Arbitrage trading account	1,142,003	1,179,606
Loans receivable	112,072	116,534
Cash and cash equivalents	1,316,603	1,568,843
Trading account receivables from brokers and clearing organizations	9,937	0
Due from broker	0	20,448
Liabilities:
Due to broker	49,178	0
Trading account payable to brokers and clearing organizations	0	53,636
Trading account securities sold but not yet purchased	68	1,169
Senior notes and other debt	1,558,985	2,526,630
Subordinated debentures	$ 810,028	$ 1,095,600

X

- Definition

Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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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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-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 45
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Fair value of subordinated debt obligations including, but not limited to, subordinated loan, subordinated bond, subordinated debenture or junior debt.

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-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
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Fair value portion of loan receivable, including, but not limited to, mortgage loans held for investment, finance receivables held for investment, policy loans on insurance contracts.

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-Publisher FASB
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-SubTopic 10
-URI http://asc.fasb.org/subtopic&trid=2196772

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The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

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Fair value portion of liabilities pertaining to principal and customer trading transactions, or which may be incurred with the objective of generating a profit from short-term fluctuations in price as part of an entity's market-making, hedging and proprietary trading. Examples include, but are not limited to, short positions in securities, derivatives and commodities.

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Amount of investment in debt security measured at fair value with change in fair value recognized in net income (trading) and investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

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