Schedule I - Summary of Investments Other Than investments in Related Parties (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Schedule of Investments [Line Items]
Amortized Cost	$ 12,737,749	$ 6,157,371
Fair Value	13,278,166	7,012,631
Equity securities, at cost	106,174	105,508
Equity securities, at fair value	111,267	108,457
Fixed maturities, trading, amortized cost	3,319,660	73,413
Fixed maturities, trading	3,302,392	82,482
Commercial Mortgage Loans	2,832,560	1,288,846
Policy loans	1,327,485	1,323,681
Short-term Investments	182,437
Other invested assets	1,209,925	520,955
Total Investment at Cost	21,715,990
Total investment per Balance Sheet	22,244,232	10,387,049
Fixed Maturities
Schedule of Investments [Line Items]
Amortized Cost	12,737,749	6,157,371
Fair Value	13,278,166	7,012,631
Equity securities
Schedule of Investments [Line Items]
Equity securities, at cost	106,174
Equity securities, at fair value	111,267
Available-for-sale Securities \| Fixed Maturities
Schedule of Investments [Line Items]
Amortized Cost	12,737,749
Fair Value	13,278,166
Trading \| Fixed Maturities
Schedule of Investments [Line Items]
Fixed maturities, trading, amortized cost	3,319,660
Fixed maturities, trading	3,302,392
U.S. Treasury securities and obligations of U.S. government authorities and agencies \| Fixed Maturities
Schedule of Investments [Line Items]
Amortized Cost	303,040	74,946
Fair Value	333,940	77,855
Obligations of U.S. states and their political subdivisions \| Fixed Maturities
Schedule of Investments [Line Items]
Amortized Cost	584,244	460,003
Fair Value	630,521	517,951
Foreign government bonds \| Fixed Maturities
Schedule of Investments [Line Items]
Amortized Cost	324,454	206,633
Fair Value	350,471	250,855
Asset-backed securities \| Fixed Maturities
Schedule of Investments [Line Items]
Amortized Cost	547,549	236,909
Fair Value	547,310	237,638
Commercial mortgage-backed securities \| Fixed Maturities
Schedule of Investments [Line Items]
Amortized Cost	552,653	480,412
Fair Value	575,184	520,947
Residential mortgage-backed securities \| Fixed Maturities
Schedule of Investments [Line Items]
Amortized Cost	18,684	49,456
Fair Value	20,180	53,235
Public utilities \| Available-for-sale Securities \| Fixed Maturities
Schedule of Investments [Line Items]
Amortized Cost	1,343,463
Fair Value	1,436,962
All other corporate bonds \| Available-for-sale Securities \| Fixed Maturities
Schedule of Investments [Line Items]
Amortized Cost	9,061,083
Fair Value	9,380,909
Redeemable preferred stock \| Available-for-sale Securities \| Fixed Maturities
Schedule of Investments [Line Items]
Amortized Cost	2,579
Fair Value	2,689
Other common stocks \| Equity securities
Schedule of Investments [Line Items]
Equity securities, at cost	467
Equity securities, at fair value	2,331
Mutual funds \| Equity securities
Schedule of Investments [Line Items]
Equity securities, at cost	96,858
Equity securities, at fair value	98,634
Perpetual preferred stocks \| Equity securities
Schedule of Investments [Line Items]
Equity securities, at cost	8,849
Equity securities, at fair value	10,302
Commercial Mortgage and Agricultural Property Loans
Schedule of Investments [Line Items]
Commercial Mortgage Loans	$ 2,832,560	$ 1,288,846

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