Related Party Transactions (Affiliated Asset Transfers) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023
Related Party Transaction [Line Items]
Additional Paid in Capital					$ 5,052,602
Realized investment gains (losses)	$ (616,495)	$ (468,256)	$ 245,387	$ (581,241)
Affiliated Entity | Prudential Insurance, January 2023, Purchase, Fixed Maturities
Related Party Transaction [Line Items]
Fair Value	48,329		48,329
Book Value	50,372		50,372
Additional Paid in Capital	1,614		1,614
Realized investment gains (losses)			0
Affiliated Entity | Prudential Insurance, March 2023, Purchase, Fixed Maturities
Related Party Transaction [Line Items]
Fair Value	7,175		7,175
Book Value	7,500		7,500
Additional Paid in Capital	256		256
Realized investment gains (losses)			0
Affiliated Entity | PURC, April 2023, Purchase, Fixed maturities
Related Party Transaction [Line Items]
Fair Value	102,804		102,804
Book Value	102,804		102,804
Additional Paid in Capital	0		0
Realized investment gains (losses)			0
Affiliated Entity | Term Re, June 2023, Purchase, Fixed Maturities
Related Party Transaction [Line Items]
Fair Value	115,573		115,573
Book Value	115,573		115,573
Additional Paid in Capital	0		0
Realized investment gains (losses)			0
Affiliated Entity | Prudential Insurance, June 2023, Purchase, Fixed Maturities
Related Party Transaction [Line Items]
Fair Value	4,298		4,298
Book Value	4,443		4,443
Additional Paid in Capital	114		114
Realized investment gains (losses)			0
Affiliated Entity | Prudential Insurance, June 2023, Purchase, Fixed Maturities 1
Related Party Transaction [Line Items]
Fair Value	4,394		4,394
Book Value	4,494		4,494
Additional Paid in Capital	80		80
Realized investment gains (losses)			0
Affiliated Entity | Prudential Insurance, June 2023, Purchase, Fixed Maturities 2
Related Party Transaction [Line Items]
Fair Value	19,453		19,453
Book Value	19,203		19,203
Additional Paid in Capital	(198)		(198)
Realized investment gains (losses)			0
Affiliated Entity | Prudential Insurance, June 2023, Purchase, Fixed Maturities 3
Related Party Transaction [Line Items]
Fair Value	14,452		14,452
Book Value	15,086		15,086
Additional Paid in Capital	502		502
Realized investment gains (losses)			0
Affiliated Entity | Prudential Insurance, September 2023, Purchase, Fixed Maturities 4
Related Party Transaction [Line Items]
Fair Value	15,880		15,880
Book Value	15,801		15,801
Additional Paid in Capital	(62)		(62)
Realized investment gains (losses)			0
Affiliated Entity | PURC - December 2023, Sale, Commercial Mortgage and Other Loans
Related Party Transaction [Line Items]
Fair Value	762		762
Book Value	754		754
Additional Paid in Capital	0		0
Realized investment gains (losses)			8
Affiliated Entity | PARU - January 2024 - Transfer in - Fixed Maturities
Related Party Transaction [Line Items]
Fair Value	1,598,161		1,598,161
Book Value	1,598,161		1,598,161
Additional Paid in Capital	0		0
Realized investment gains (losses)			0
Affiliated Entity | PARU - January 2024 - Transfer in - Fixed Maturities 1
Related Party Transaction [Line Items]
Fair Value	778,745		778,745
Book Value	778,745		778,745
Additional Paid in Capital	0		0
Realized investment gains (losses)			0
Affiliated Entity | PURC - January 2024 - Transfer in - Fixed Maturities
Related Party Transaction [Line Items]
Fair Value	2,155,560		2,155,560
Book Value	2,155,560		2,155,560
Additional Paid in Capital	0		0
Realized investment gains (losses)			0
Affiliated Entity | GUL Re - January 2024 - Transfer in - Fixed Maturities
Related Party Transaction [Line Items]
Fair Value	1,685,582		1,685,582
Book Value	1,685,582		1,685,582
Additional Paid in Capital	0		0
Realized investment gains (losses)			0
Affiliated Entity | GUL Re - January 2024 - Transfer in - Fixed Maturities 1
Related Party Transaction [Line Items]
Fair Value	4,976		4,976
Book Value	4,976		4,976
Additional Paid in Capital	0		0
Realized investment gains (losses)			0
Affiliated Entity | PURE - January 2024 - Transfer out - Fixed Maturities
Related Party Transaction [Line Items]
Fair Value	1,598,161		1,598,161
Book Value	1,598,161		1,598,161
Additional Paid in Capital	0		0
Realized investment gains (losses)			0
Affiliated Entity | PURE - January 2024 - Transfer out - Fixed Maturities 1
Related Party Transaction [Line Items]
Fair Value	778,745		778,745
Book Value	778,745		778,745
Additional Paid in Capital	0		0
Realized investment gains (losses)			0
Affiliated Entity | PURE - January 2024 - Transfer out - Fixed Maturities 2
Related Party Transaction [Line Items]
Fair Value	2,155,560		2,155,560
Book Value	2,155,560		2,155,560
Additional Paid in Capital	0		0
Realized investment gains (losses)			0
Affiliated Entity | PURE - January 2024 - Transfer out - Fixed Maturities 3
Related Party Transaction [Line Items]
Fair Value	1,685,582		1,685,582
Book Value	1,685,582		1,685,582
Additional Paid in Capital	0		0
Realized investment gains (losses)			0
Affiliated Entity | PURE - January 2024 - Transfer out - Fixed Maturities 4
Related Party Transaction [Line Items]
Fair Value	4,976		4,976
Book Value	4,976		4,976
Additional Paid in Capital	0		0
Realized investment gains (losses)			0
Affiliated Entity | Ironbound - January 2024 - Purchase - Other Invested Assets
Related Party Transaction [Line Items]
Fair Value	60,414		60,414
Book Value	60,414		60,414
Additional Paid in Capital	0		0
Realized investment gains (losses)			0
Affiliated Entity | Windhill CLO 1, Ltd. - February 2024 - Sale - Fixed Maturities
Related Party Transaction [Line Items]
Fair Value	18,428		18,428
Book Value	18,858		18,858
Additional Paid in Capital	0		0
Realized investment gains (losses)			(430)
Affiliated Entity | Windhill CLO 2, Ltd - February 2024 - Sale - Fixed Maturities
Related Party Transaction [Line Items]
Fair Value	19,652		19,652
Book Value	20,057		20,057
Additional Paid in Capital	0		0
Realized investment gains (losses)			(405)
Affiliated Entity | PAR Term - February 2024 - Purchase - Fixed Maturities
Related Party Transaction [Line Items]
Fair Value	43,084		43,084
Book Value	43,084		43,084
Additional Paid in Capital	0		0
Realized investment gains (losses)			0
Affiliated Entity | Windhill CLO 1, Ltd. - March 2024 - Sale - Fixed Maturities
Related Party Transaction [Line Items]
Fair Value	10,148		10,148
Book Value	10,387		10,387
Additional Paid in Capital	0		0
Realized investment gains (losses)			(239)
Affiliated Entity | Windhill CLO 2, Ltd. - March 2024 - Sale - Fixed Maturities
Related Party Transaction [Line Items]
Fair Value	14,763		14,763
Book Value	15,091		15,091
Additional Paid in Capital	0		0
Realized investment gains (losses)			(328)
Affiliated Entity | Prudential Insurance - March 2024 - Purchase - Fixed Maturities
Related Party Transaction [Line Items]
Fair Value	198,804		198,804
Book Value	206,285		206,285
Additional Paid in Capital	5,910		5,910
Realized investment gains (losses)			0
Affiliated Entity | PAR U - March 2024 - Transfer in - Other Invested Assets
Related Party Transaction [Line Items]
Fair Value	188,500		188,500
Book Value	188,500		188,500
Additional Paid in Capital	0		0
Realized investment gains (losses)			0
Affiliated Entity | PURE - March 2024 - Transfer out - Other Invested Assets
Related Party Transaction [Line Items]
Fair Value	188,500		188,500
Book Value	188,500		188,500
Additional Paid in Capital	0		0
Realized investment gains (losses)			0
Affiliated Entity | Windhill CLO 1, Ltd. - April 2024 - Sale - Fixed Maturities
Related Party Transaction [Line Items]
Fair Value	2,261		2,261
Book Value	2,300		2,300
Additional Paid in Capital	0		0
Realized investment gains (losses)			(39)
Affiliated Entity | Windhill CLO 2, Ltd. - May 2024 - Sale - Fixed Maturities
Related Party Transaction [Line Items]
Fair Value	14,034		14,034
Book Value	14,415		14,415
Additional Paid in Capital	0		0
Realized investment gains (losses)			(381)
Affiliated Entity | Windhill CLO 1, Ltd. - June 2024 - Sale - Fixed Maturities
Related Party Transaction [Line Items]
Fair Value	2,045		2,045
Book Value	2,100		2,100
Additional Paid in Capital	0		0
Realized investment gains (losses)			(55)
Affiliated Entity | Windhill CLO 2, Ltd. - June 2024 - Sale - Fixed Maturities
Related Party Transaction [Line Items]
Fair Value	23,342		23,342
Book Value	23,743		23,743
Additional Paid in Capital	0		0
Realized investment gains (losses)			(401)
Affiliated Entity | PAR U - June 2024 - Transfer in - Other Invested Assets
Related Party Transaction [Line Items]
Fair Value	326		326
Book Value	326		326
Additional Paid in Capital	0		0
Realized investment gains (losses)			0
Affiliated Entity | PURE - June 2024 - Transfer out - Other Invested Assets
Related Party Transaction [Line Items]
Fair Value	326		326
Book Value	326		326
Additional Paid in Capital	0		0
Realized investment gains (losses)			0
Affiliated Entity | PAR U - June 2024 - Purchase - Commercial Mortgage and Othe Loans
Related Party Transaction [Line Items]
Fair Value	12,555		12,555
Book Value	12,555		12,555
Additional Paid in Capital	0		0
Realized investment gains (losses)			0
Affiliated Entity | Windhill CLO 2, Ltd. - July 2024 - Sale - Fixed Maturities
Related Party Transaction [Line Items]
Fair Value	53,462		53,462
Book Value	54,628		54,628
Additional Paid in Capital	0		0
Realized investment gains (losses)			(1,166)
Affiliated Entity | Windhill CLO 2, Ltd. - July 2024 - Sale - Fixed Maturities1
Related Party Transaction [Line Items]
Fair Value	6,579		6,579
Book Value	6,695		6,695
Additional Paid in Capital	0		0
Realized investment gains (losses)			(116)
Affiliated Entity | Windhill CLO 1, Ltd. - July 2024 - Sale - Fixed Maturities
Related Party Transaction [Line Items]
Fair Value	2,136		2,136
Book Value	2,200		2,200
Additional Paid in Capital	0		0
Realized investment gains (losses)			(64)
Affiliated Entity | PAR U - July 2024 - Purchase - Fixed Maturities
Related Party Transaction [Line Items]
Fair Value	17,402		17,402
Book Value	17,402		17,402
Additional Paid in Capital	0		0
Realized investment gains (losses)			0
Affiliated Entity | Prudential Insurance - July 2024 - Purchase - Fixed Maturities
Related Party Transaction [Line Items]
Fair Value	22,655		22,655
Book Value	23,433		23,433
Additional Paid in Capital	614		614
Realized investment gains (losses)			0
Affiliated Entity | PAR U - July 2024 - Purchase - Fixed Maturities1
Related Party Transaction [Line Items]
Fair Value	1,239		1,239
Book Value	1,239		1,239
Additional Paid in Capital	0		0
Realized investment gains (losses)			0
Affiliated Entity | PAR U - July 2024 - Purchase - Derivatives
Related Party Transaction [Line Items]
Fair Value	2,975		2,975
Book Value	2,975		2,975
Additional Paid in Capital	0		0
Realized investment gains (losses)			0
Affiliated Entity | Windhill CLO 2, Ltd. - August 2024 - Sale - Fixed Maturities
Related Party Transaction [Line Items]
Fair Value	21,929		21,929
Book Value	22,500		22,500
Additional Paid in Capital	0		0
Realized investment gains (losses)			(571)
Affiliated Entity | Windhill CLO 1, Ltd. - August 2024 - Sale - Fixed Maturities
Related Party Transaction [Line Items]
Fair Value	13,650		13,650
Book Value	14,100		14,100
Additional Paid in Capital	0		0
Realized investment gains (losses)			(450)
Affiliated Entity | PAR U - August 2024 - Purchase - Fixed Maturities
Related Party Transaction [Line Items]
Fair Value	46,742		46,742
Book Value	46,742		46,742
Additional Paid in Capital	0		0
Realized investment gains (losses)			0
Affiliated Entity | PAR U - August 2024 - Purchase - Fixed Maturities1
Related Party Transaction [Line Items]
Fair Value	4,793		4,793
Book Value	4,793		4,793
Additional Paid in Capital	0		0
Realized investment gains (losses)			0
Affiliated Entity | Prudential Insurance - August 2024 - Purchase - Fixed Maturities
Related Party Transaction [Line Items]
Fair Value	35,872		35,872
Book Value	35,085		35,085
Additional Paid in Capital	(621)		(621)
Realized investment gains (losses)			0
Affiliated Entity | Windhill CLO 2, Ltd. - September 2024 - Sale - Fixed Maturities
Related Party Transaction [Line Items]
Fair Value	57,613		57,613
Book Value	57,613		57,613
Additional Paid in Capital	0		0
Realized investment gains (losses)			0
Affiliated Entity | Windhill CLO 2, Ltd. - September 2024 - Sale - Fixed Maturities1
Related Party Transaction [Line Items]
Fair Value	24,575		24,575
Book Value	24,911		24,911
Additional Paid in Capital	0		0
Realized investment gains (losses)			(336)
Affiliated Entity | Prudential Insurance - September 2024 - Purchase - Fixed Maturities
Related Party Transaction [Line Items]
Fair Value	44,773		44,773
Book Value	43,632		43,632
Additional Paid in Capital	$ (901)		(901)
Realized investment gains (losses)			$ 0