Equity (Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance			$ 347,435
Income tax benefit (expense)	$ 181,602	$ 15,007	584,114	$ 43,342
Ending Balance	(1,855,849)		(1,855,849)
Foreign Currency Translation Adjustments
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance			(11,274)	(7,797)
Change in OCI before reclassifications			(11,519)	(3,904)
Amounts reclassified from AOCI			0	0
Income tax benefit (expense)			1,357	313
Ending Balance	(21,436)	(11,388)	(21,436)	(11,388)
Net unrealized investment gains (losses)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance			358,709	553,925
Change in OCI before reclassifications			(2,719,993)	(181,041)
Amounts reclassified from AOCI			(55,886)	(23,861)
Income tax benefit (expense)			582,757	43,029
Ending Balance	(1,834,413)	392,052	(1,834,413)	392,052
Accumulated Other Comprehensive   Income (Loss)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance			347,435	546,128
Change in OCI before reclassifications			(2,731,512)	(184,945)
Amounts reclassified from AOCI			(55,886)	(23,861)
Income tax benefit (expense)			584,114	43,342
Ending Balance	(1,855,849)	380,664	(1,855,849)	380,664
Cash flow hedges | Net unrealized investment gains (losses)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance			40,000	(8,000)
Ending Balance	$ 228,000	$ 32,000	$ 228,000	$ 32,000