Schedule I - Summary of Investments Other Than investments in Related Parties (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Schedule of Investments [Line Items]
Amortized Cost	$ 21,311,087	$ 12,737,749
Fair Value	19,025,401	13,278,166
Equity securities, at cost	148,179	106,174
Equity securities, at fair value	143,072	111,267
Fixed maturities, trading, amortized cost	2,682,022	3,319,660
Fixed maturities, trading	1,936,159	3,302,392
Commercial Mortgage Loans	4,928,680	2,832,560
Policy loans	505,367	1,327,485
Short-term Investments	124,491
Other invested assets	1,088,613	1,209,925
Total Investment at Cost	30,788,439
Total investment per Balance Sheet	27,751,783	22,244,232
Fixed maturities
Schedule of Investments [Line Items]
Amortized Cost	21,311,087	12,737,749
Fair Value	19,025,401	13,278,166
Equity securities
Schedule of Investments [Line Items]
Equity securities, at cost	148,179
Equity securities, at fair value	143,072
Available-for-sale \| Fixed maturities
Schedule of Investments [Line Items]
Amortized Cost	21,311,087
Fair Value	19,025,401
Trading \| Fixed maturities
Schedule of Investments [Line Items]
Fixed maturities, trading, amortized cost	2,682,022
Fixed maturities, trading	1,936,159
U.S. Treasury securities and obligations of U.S. government authorities and agencies \| Fixed maturities
Schedule of Investments [Line Items]
Amortized Cost	354,348	303,040
Fair Value	281,792	333,940
Obligations of U.S. states and their political subdivisions \| Fixed maturities
Schedule of Investments [Line Items]
Amortized Cost	654,884	584,244
Fair Value	628,200	630,521
Foreign government bonds \| Fixed maturities
Schedule of Investments [Line Items]
Amortized Cost	330,967	324,454
Fair Value	273,462	350,471
Asset-backed securities \| Fixed maturities
Schedule of Investments [Line Items]
Amortized Cost	1,467,955	547,549
Fair Value	1,442,354	547,310
Commercial mortgage-backed securities \| Fixed maturities
Schedule of Investments [Line Items]
Amortized Cost	727,159	552,653
Fair Value	658,152	575,184
Residential mortgage-backed securities \| Fixed maturities
Schedule of Investments [Line Items]
Amortized Cost	342,493	18,684
Fair Value	336,216	20,180
Public utilities \| Available-for-sale \| Fixed maturities
Schedule of Investments [Line Items]
Amortized Cost	1,895,412
Fair Value	1,642,060
All other corporate bonds \| Available-for-sale \| Fixed maturities
Schedule of Investments [Line Items]
Amortized Cost	15,535,223
Fair Value	13,760,732
Redeemable preferred stock \| Available-for-sale \| Fixed maturities
Schedule of Investments [Line Items]
Amortized Cost	2,646
Fair Value	2,433
Other common stocks \| Equity securities
Schedule of Investments [Line Items]
Equity securities, at cost	111,987
Equity securities, at fair value	109,609
Mutual funds \| Equity securities
Schedule of Investments [Line Items]
Equity securities, at cost	7,681
Equity securities, at fair value	6,297
Perpetual preferred stocks \| Equity securities
Schedule of Investments [Line Items]
Equity securities, at cost	28,511
Equity securities, at fair value	27,166
Commercial Mortgage and Agricultural Loans
Schedule of Investments [Line Items]
Commercial Mortgage Loans	$ 4,928,680	$ 2,832,560

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