Equity (Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance			$ (30,920)
Income tax benefit (expense)	$ (226,942)	$ 201,437	(103,381)	$ 194,021
Ending Balance	359,542		359,542
Foreign Currency Translation Adjustments
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance			(18,085)	(20,007)
Change in OCI before reclassifications			1,578	431
Amounts reclassified from AOCI			0	0
Income tax benefit (expense)			(228)	(51)
Ending Balance	(16,735)	(19,627)	(16,735)	(19,627)
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			620,926	(482,272)
Amounts reclassified from AOCI			26,605	(17,746)
Income tax benefit (expense)			(135,768)	105,037
Ending Balance	(416,015)	(1,869,456)	(416,015)	(1,869,456)
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			(21,655)	73,321
Amounts reclassified from AOCI			0	0
Income tax benefit (expense)			4,557	(15,396)
Ending Balance	54,097	177,293	54,097	177,293
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			(133,611)	(497,289)
Amounts reclassified from AOCI			0	0
Income tax benefit (expense)			28,058	104,431
Ending Balance	738,195	972,191	738,195	972,191
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			467,238	(905,809)
Amounts reclassified from AOCI			26,605	(17,746)
Income tax benefit (expense)			(103,381)	194,021
Ending Balance	359,542	(739,599)	359,542	(739,599)
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	$ 2,000	$ 94,000	$ 2,000	$ 94,000