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Fair Value of Financial Instruments - Carrying Amount and Fair Value of Financial Instruments (Detail) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Financial assets    
Fair value of bonds held-to-maturity $ 8,501,656 $ 8,968,690
Fixed maturity securities, bonds available-for-sale 6,480,374 6,725,085
Equity securities 1,375,083 1,700,960
Policy loans 380,084 379,657
Short-term investments 418,882 425,321
Separate account assets 893,856 1,073,891
Financial liabilities    
Separate account liabilities 893,856 1,073,891
Fair Value, Inputs, Level 1, 2 and 3    
Financial assets    
Separate account assets 871,196 1,049,938
Financial liabilities    
Separate account liabilities 871,196 1,049,938
Carrying Amount    
Financial assets    
Fair value of bonds held-to-maturity 8,554,809 8,631,261
Fixed maturity securities, bonds available-for-sale 6,480,374 6,725,085
Equity securities 1,375,083 1,700,960
Options 125,988 256,005
Mortgage loans on real estate, net allowance 5,125,365 5,097,017
Policy loans 380,084 379,657
Short-term investments 418,882 425,321
Separate account assets 893,856 1,073,891
Separately managed accounts 50,583 50,503
Total financial assets 23,405,024 24,339,700
Financial liabilities    
Investment contracts 10,242,029 10,254,959
Embedded derivative liability for equity-indexed contracts 630,952 731,552
Notes payable 156,943 157,997
Separate account liabilities 893,856 1,073,891
Total financial liabilities 11,923,780 12,218,399
Fair Value    
Financial assets    
Fair value of bonds held-to-maturity 8,501,656 8,968,690
Fixed maturity securities, bonds available-for-sale 6,480,374 6,725,085
Equity securities 1,375,083 1,700,960
Options 125,988 256,005
Mortgage loans on real estate, net allowance 5,497,500 5,309,005
Policy loans 380,084 379,657
Short-term investments 418,882 425,321
Separate account assets 893,856 1,073,891
Separately managed accounts 50,583 50,503
Total financial assets 23,724,006 24,889,117
Financial liabilities    
Investment contracts 10,242,029 10,254,959
Embedded derivative liability for equity-indexed contracts 630,952 731,552
Notes payable 156,943 157,997
Separate account liabilities 893,856 1,073,891
Total financial liabilities $ 11,923,780 $ 12,218,399