Deferred Policy Acquisition Costs, Deferred Reinsurance Losses, Deferred Reinsurance Gains And Deferred Sales Inducements (Balance of and Changes in DAC) (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2023		Jun. 30, 2022
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward]
Deferred Policy Acquisition Cost, Beginning Balance	$ 6,930,425	[1]	$ 7,029,307
Capitalization	513,893		489,077
Amortization expense	(266,642)		(255,964)
Other adjustments	(393,385)		(541,406)
Balance, end of period	6,784,291		6,721,014
Fixed Annuities
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward]
Deferred Policy Acquisition Cost, Beginning Balance	102,251		84,479
Capitalization	48,552		3,202
Amortization expense	(9,490)		(6,773)
Other adjustments	0		0
Balance, end of period	141,313		80,908
Variable Annuities
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward]
Deferred Policy Acquisition Cost, Beginning Balance	3,736,454		3,806,733
Capitalization	117,342		155,694
Amortization expense	(166,332)		(171,593)
Other adjustments	(393,385)		0
Balance, end of period	3,294,079		3,790,834
Term Life
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward]
Deferred Policy Acquisition Cost, Beginning Balance	648,837		577,084
Capitalization	72,216		66,040
Amortization expense	(31,084)		(26,020)
Other adjustments	0		2
Balance, end of period	689,969		617,106
Variable/Universal Life
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward]
Deferred Policy Acquisition Cost, Beginning Balance	2,442,883		2,561,011
Capitalization	275,783		264,141
Amortization expense	(59,736)		(51,578)
Other adjustments	0		(541,408)
Balance, end of period	$ 2,658,930		$ 2,232,166

[1] Prior period amounts adjusted for the implementation of Accounting Standard Update ("ASU") 2018-12: Targeted Improvements to the Accounting for Long-Duration Contracts.