Equity (Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance			$ (30,920)
Income tax benefit (expense)	$ 14,270	$ 102,846	123,561	$ (7,416)
Ending Balance	(498,247)		(498,247)
Foreign Currency Translation Adjustments
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance			(18,085)	(20,007)
Change in OCI before reclassifications			(4,178)	3,266
Amounts reclassified from AOCI			0	0
Income tax benefit (expense)			275	(363)
Ending Balance	(21,988)	(17,104)	(21,988)	(17,104)
Net unrealized investment gains (losses)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance			(927,778)	(1,474,475)
Change in OCI before reclassifications			(448,732)	116,395
Amounts reclassified from AOCI			(20,268)	2,479
Income tax benefit (expense)			98,567	(24,884)
Ending Balance	(1,298,211)	(1,380,485)	(1,298,211)	(1,380,485)
Interest Rate Remeasurement of Future Policy Benefits
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance			71,195	119,368
Change in OCI before reclassifications			66,215	(17,588)
Amounts reclassified from AOCI			0	0
Income tax benefit (expense)			(13,905)	3,693
Ending Balance	123,505	105,473	123,505	105,473
Gain (Loss) from Changes in Non-Performance Risk on Market Risk Benefits
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance			843,748	1,365,049
Change in OCI before reclassifications			(183,925)	(67,323)
Amounts reclassified from AOCI			0	0
Income tax benefit (expense)			38,624	14,138
Ending Balance	698,447	1,311,864	698,447	1,311,864
Accumulated Other Comprehensive   Income (Loss)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance			(30,920)	(10,065)
Change in OCI before reclassifications			(570,620)	34,750
Amounts reclassified from AOCI			(20,268)	2,479
Income tax benefit (expense)			123,561	(7,416)
Ending Balance	(498,247)	19,748	(498,247)	19,748
Cash flow hedges | Net unrealized investment gains (losses)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance			12,000	139,000
Ending Balance	$ 75,000	$ 100,000	$ 75,000	$ 100,000