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Consolidated Balance Sheets (Parentheticals) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Fixed maturity securities, available for sale, amortized cost [1] $ 42,114,459 $ 42,304,736
Fixed maturity securities, available for sale, allowance for credit losses 59,698 64,771
Mortgage loans on real estate, allowance for credit losses 28,514 31,029
Coinsurance deposits, allowance for credit losses $ 2,032 $ 1,888
Stockholders' equity:    
Common stock, par value (dollars per share) $ 1 $ 1
Common stock, shares authorized 200,000,000 200,000,000
Common stock, shares issued 95,482,733 95,720,622
Common stock, shares outstanding 95,482,733 95,720,622
Common stock, shares held in treasury 6,916,584 6,516,525
Preferred Stock, Series A    
Stockholders' equity:    
Preferred stock, par value (dollars per share) $ 1 $ 1
Preferred stock, aggregate liquidation preference $ 400,000 $ 400,000
Preferred stock, shares authorized 20,000 20,000
Preferred stock, shares issued 16,000 16,000
Preferred stock, shares outstanding 16,000 16,000
Preferred Stock, Series B    
Stockholders' equity:    
Preferred stock, par value (dollars per share) $ 1 $ 1
Preferred stock, aggregate liquidation preference $ 300,000 $ 300,000
Preferred stock, shares authorized 12,000 12,000
Preferred stock, shares issued 12,000 12,000
Preferred stock, shares outstanding 12,000 12,000
[1] Amortized cost excludes accrued interest receivable of $389.2 million and $377.5 million as of March 31, 2021 and December 31, 2020, respectively.