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Fair Value Of Financial Instruments
3 Months Ended
Mar. 31, 2021
Fair Value Disclosures [Abstract]  
Fair Value Of Financial Instruments Fair Value Measurements
    The Company’s fixed maturity available for sale securities, equity securities and its arbitrage trading account securities are carried at fair value. Fair value is defined as “the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date.” The Company utilizes a fair value hierarchy that prioritizes the inputs to valuation techniques used to measure fair value into three broad levels, as follows:
Level 1 - Quoted prices (unadjusted) in active markets for identical assets or liabilities that the Company has the ability to access at the measurement date.
Level 2 - Quoted prices for similar assets or valuations based on inputs that are observable.
Level 3 - Estimates of fair value based on internal pricing methodologies using unobservable inputs. Unobservable inputs are only used to measure fair value to the extent that observable inputs are not available.
    Substantially all of the Company’s fixed maturity securities were priced by independent pricing services. The prices provided by the independent pricing services are estimated based on observable market data in active markets utilizing pricing models and processes, which may include benchmark yields, reported trades, broker/dealer quotes, issuer spreads, two-sided markets, benchmark securities, bids, offers, sector groupings, matrix pricing and reference data. The pricing services may prioritize inputs differently on any given day for any security based on market conditions, and not all inputs are available for each security evaluation on any given day. The pricing services used by the Company have indicated that they will only produce an estimate of fair value if objectively verifiable information is available. The determination of whether markets are active or inactive is based upon the volume and level of activity for a particular asset class. The Company reviews the prices provided by pricing services for reasonableness and periodically performs independent price tests of a sample of securities to ensure proper valuation.
    If prices from independent pricing services are not available for fixed maturity securities, the Company estimates the fair value. For Level 2 securities, the Company utilizes pricing models and processes which may include benchmark yields, sector groupings, matrix pricing, reported trades, broker/dealer quotes, issuer spreads, two-sided markets, bids, offers and reference data. Where broker quotes are used, the Company generally requests two or more quotes and sets a price within the range of quotes received based on its assessment of the credibility of the quote and its own evaluation of the security. The Company generally does not adjust quotes received from brokers. For securities traded only in private negotiations, the Company determines fair value based primarily on the cost of such securities, which is adjusted to reflect prices of recent placements of securities of the same issuer, financial projections, credit quality and business developments of the issuer and other relevant information.
    For Level 3 securities, the Company generally uses a discounted cash flow model to estimate the fair value of fixed maturity securities. The cash flow models are based upon assumptions as to prevailing credit spreads, interest rate and interest rate volatility, time to maturity and subordination levels. Projected cash flows are discounted at rates that are adjusted to reflect illiquidity, where appropriate.
    
    The following tables present the assets and liabilities measured at fair value on a recurring basis as of March 31, 2021 and December 31, 2020 by level:
(In thousands)TotalLevel 1Level 2Level 3
March 31, 2021
Assets:
Fixed maturity securities available for sale:
U.S. government and government agency$555,714 $— $555,714 $— 
State and municipal3,502,593 — 3,502,593 — 
Mortgage-backed securities1,076,024 — 1,076,024 — 
Asset-backed securities3,944,638 — 3,944,638 — 
Corporate5,218,189 — 5,218,189 — 
Foreign government1,029,879 — 1,029,879 — 
Total fixed maturity securities available for sale15,327,037 — 15,327,037 — 
Equity securities:
Common stocks392,163 382,822 — 9,341 
Preferred stocks229,466 — 220,135 9,331 
Total equity securities621,629 382,822 220,135 18,672 
Arbitrage trading account614,721 498,401 116,320 — 
Total$16,563,387 $881,223 $15,663,492 $18,672 
Liabilities:
Trading account securities sold but not yet purchased$218 $218 $— $— 
December 31, 2020
Assets:
Fixed maturity securities available for sale:
U.S. government and government agency$603,871 $— $603,871 $— 
State and municipal3,620,664 — 3,620,664 — 
Mortgage-backed securities1,020,330 — 1,020,330 — 
Asset-backed securities3,194,586 — 3,194,586 — 
Corporate4,671,581 — 4,670,581 1,000 
Foreign government975,563 — 975,563 — 
Total fixed maturity securities available for sale14,086,595 — 14,085,595 1,000 
Equity securities:
Common stocks350,181 340,966 — 9,215 
Preferred stocks275,486 — 266,155 9,331 
Total equity securities625,667 340,966 266,155 18,546 
Arbitrage trading account341,473 298,359 43,114 — 
Total$15,053,735 $639,325 $14,394,864 $19,546 
Liabilities:
Trading account securities sold but not yet purchased$10,048 $10,048 $— $— 
    The following tables summarize changes in Level 3 assets and liabilities for the three months ended March 31, 2021 and for the year ended December 31, 2020:
  
                        Gains (Losses) Included in:
(In thousands)Beginning
Balance
Earnings (Losses)Other
Comprehensive
Income
ImpairmentsPurchases(Sales)Paydowns / MaturitiesTransfers In / (Out)Ending
Balance
Three Months Ended March 31, 2021
Assets:
Fixed maturities securities available for sale:
Corporate$1,000 $— $— $— $— $(1,000)$— $— $— 
Total1,000 — — — — (1,000)— — — 
Equity securities:
Common stocks$9,215 $126 $— $— $— $— $— $— $9,341 
Preferred stocks9,331 — — — — — — — 9,331 
Total18,546 126 — — — — — — 18,672 
Arbitrage trading account— — — — (1)— — — 
Total$19,546 $127 $— $— $— $(1,001)$— $— $18,672 
Year Ended
December 31, 2020
Assets:
Fixed maturities securities available for sale:
Corporate$— $— $— $— $— $— $— $1,000 $1,000 
Total— — — — — — — 1,000 1,000 
Equity securities:
Common stocks9,053 1,228 — — — (1,066)— — 9,215 
Preferred stocks6,505 (174)— — 3,000 — — — 9,331 
Total15,558 1,054 — — 3,000 (1,066)— — 18,546 
Arbitrage trading account— 19 — — — (19)— — — 
Total$15,558 $1,073 $— $— $3,000 $(1,085)$— $1,000 $19,546 
    For the three months ended March 31, 2021, there were no securities transferred into or out of Level 3. For the year ended December 31, 2020, a fixed maturity security was transferred from Level 2 into Level 3 as a result of observable valuation inputs no longer being available.
Fair Value of Financial Instruments
    The following table presents the carrying amounts and estimated fair values of the Company’s financial instruments:
  March 31, 2021December 31, 2020
(In thousands)Carrying ValueFair ValueCarrying ValueFair Value
Assets:
Fixed maturity securities$15,400,118 $15,412,192 $14,159,369 $14,173,629 
Equity securities621,629 621,629 625,667 625,667 
Arbitrage trading account614,721 614,721 341,473 341,473 
Loans receivable76,896 78,504 84,913 86,596 
Cash and cash equivalents2,014,911 2,014,911 2,372,366 2,372,366 
Trading account receivables from brokers and clearing organizations257,756 257,756 524,727 524,727 
     Due from broker— — 2,585 2,585 
Liabilities:
Due to broker149,295 149,295 — — 
Trading account securities sold but not yet purchased218 218 10,048 10,048 
Senior notes and other debt2,021,142 2,191,022 1,623,025 1,892,444 
Subordinated debentures1,289,272 1,364,002 1,102,309 1,202,842 
    The estimated fair values of the Company’s fixed maturity securities, equity securities and arbitrage trading account securities are based on various valuation techniques that rely on fair value measurements as described in Note 15. The fair value of loans receivable are estimated by using current institutional purchaser yield requirements for loans with similar credit characteristics, which is considered a Level 2 input. The fair value of the senior notes and other debt and the subordinated debentures is based on spreads for similar securities, which is considered a Level 2 input.
In April 2021, the Company announced it will redeem the $290 million aggregate principal amount of its 5.75% subordinated debentures due 2056 on June 1, 2021.