Related Party Transactions (Affiliated Asset Transfers) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Related Party Transaction [Line Items]
Additional Paid in Capital			$ 5,052,602
Realized investment gains (losses)	$ 108,643	$ (120,679)
Affiliated Entity | Prudential Insurance, January 2023, Purchase, Fixed Maturities
Related Party Transaction [Line Items]
Fair Value	48,329
Book Value	50,372
Additional Paid in Capital	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
Book Value	7,500
Additional Paid in Capital	256
Realized investment gains (losses)	0
Affiliated Entity | PURC, April 2023, Purchase, Fixed maturities
Related Party Transaction [Line Items]
Fair Value	102,804
Book Value	102,804
Additional Paid in Capital	0
Realized investment gains (losses)	0
Affiliated Entity | Term Re, June 2023, Purchase, Fixed Maturities
Related Party Transaction [Line Items]
Fair Value	115,573
Book Value	115,573
Additional Paid in Capital	0
Realized investment gains (losses)	0
Affiliated Entity | Prudential Insurance, June 2023, Purchase, Fixed Maturities
Related Party Transaction [Line Items]
Fair Value	4,298
Book Value	4,443
Additional Paid in Capital	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
Book Value	4,494
Additional Paid in Capital	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
Book Value	19,203
Additional Paid in Capital	(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
Book Value	15,086
Additional Paid in Capital	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
Book Value	15,801
Additional Paid in Capital	(62)
Realized investment gains (losses)	0
Affiliated Entity | Prudential Insurance - December 2023, Sale, Commercial Mortgage and Other Loans
Related Party Transaction [Line Items]
Fair Value	762
Book Value	754
Additional Paid in Capital	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
Book Value	1,598,161
Additional Paid in Capital	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
Book Value	778,745
Additional Paid in Capital	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
Book Value	2,155,560
Additional Paid in Capital	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
Book Value	1,685,582
Additional Paid in Capital	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
Book Value	4,976
Additional Paid in Capital	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
Book Value	1,598,161
Additional Paid in Capital	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
Book Value	778,745
Additional Paid in Capital	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
Book Value	2,155,560
Additional Paid in Capital	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
Book Value	1,685,582
Additional Paid in Capital	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
Book Value	4,976
Additional Paid in Capital	0
Realized investment gains (losses)	0
Affiliated Entity | Ironbound - January 2024 - Purchase - Other Invested Assets
Related Party Transaction [Line Items]
Fair Value	60,414
Book Value	60,414
Additional Paid in Capital	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
Book Value	18,858
Additional Paid in Capital	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
Book Value	20,057
Additional Paid in Capital	0
Realized investment gains (losses)	(405)
Affiliated Entity | PAR Term - February 2024 - Purchase - Fixed Maturities
Related Party Transaction [Line Items]
Fair Value	43,084
Book Value	43,084
Additional Paid in Capital	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
Book Value	10,387
Additional Paid in Capital	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
Book Value	15,091
Additional Paid in Capital	0
Realized investment gains (losses)	(328)
Affiliated Entity | Prudential Insurance - March 2024 - Purchase - Fixed Maturities
Related Party Transaction [Line Items]
Fair Value	198,804
Book Value	206,285
Additional Paid in Capital	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
Book Value	188,500
Additional Paid in Capital	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
Book Value	188,500
Additional Paid in Capital	0
Realized investment gains (losses)	$ 0