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Equity (Net Unrealized Investment Gains (Losses) in AOCI on AFS Fixed Maturity Securities with OTTI, Allowance for Credit Losses and All Other Investments (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Beginning balance $ 347,435    
Ending balance (1,581,300) $ 347,435  
Accumulated Net Unrealized Investment Gains (Losses) Pre-Tax with Allowance      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Beginning balance 3,685 0 $ 0
Net unrealized investment gains (losses) on investments arising during period (149) 2,951 616
Reclassification adjustment for (gains) losses included in net income 831 (8) 0
Reclassification due to implementation of ASU 2016-13     0
Reclassification due to allowance for credit losses recorded during the period 4 742 (616)
Impact of net unrealized investment (gains) losses 0 0 0
Ending balance 4,371 3,685 0
Accumulated Net Unrealized Investment Gains (Losses) Pre Tax All Other      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Beginning balance 582,704 849,349 423,612
Net unrealized investment gains (losses) on investments arising during period (2,737,565) (240,917) 416,479
Reclassification adjustment for (gains) losses included in net income (5,259) (24,986) 7,074
Reclassification due to implementation of ASU 2016-13     1,568
Reclassification due to allowance for credit losses recorded during the period (4) (742) 616
Impact of net unrealized investment (gains) losses 0 0 0
Ending balance (2,160,124) 582,704 849,349
Deferred Policy Acquisition Costs and Other Costs      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Beginning balance 983,085 1,200,048 423,227
Net unrealized investment gains (losses) on investments arising during period 0 0 0
Reclassification adjustment for (gains) losses included in net income 0 0 0
Reclassification due to implementation of ASU 2016-13     0
Reclassification due to allowance for credit losses recorded during the period 0 0 0
Impact of net unrealized investment (gains) losses (2,177,588) (216,963) 776,821
Ending balance (1,194,503) 983,085 1,200,048
Future Policy Benefits and Policyholders' Account Balances and Other Liabilities      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Beginning balance (1,115,484) (1,348,231) (482,134)
Net unrealized investment gains (losses) on investments arising during period 0 0 0
Reclassification adjustment for (gains) losses included in net income 0 0 0
Reclassification due to implementation of ASU 2016-13     0
Reclassification due to allowance for credit losses recorded during the period 0 0 0
Impact of net unrealized investment (gains) losses 2,489,492 232,747 (866,097)
Ending balance 1,374,008 (1,115,484) (1,348,231)
Income Tax Benefit (Expense)      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Beginning balance (95,281) (147,241) (76,914)
Net unrealized investment gains (losses) on investments arising during period 574,791 50,016 (87,588)
Reclassification adjustment for (gains) losses included in net income 930 5,277 (1,486)
Reclassification due to implementation of ASU 2016-13     0
Reclassification due to allowance for credit losses recorded during the period 0 0 0
Impact of net unrealized investment (gains) losses (65,485) (3,333) 18,747
Ending balance 414,955 (95,281) (147,241)
Accumulated Other Comprehensive Income (Loss) Related to Net Unrealized Investment Gains (Losses)      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Beginning balance 358,709 553,925 289,359
Net unrealized investment gains (losses) on investments arising during period (2,162,923) (187,950) 329,507
Reclassification adjustment for (gains) losses included in net income (3,498) (19,717) 5,588
Reclassification due to implementation of ASU 2016-13     0
Reclassification due to allowance for credit losses recorded during the period 0 0 0
Impact of net unrealized investment (gains) losses 246,419 12,451 (70,529)
Ending balance (1,561,293) 358,709 553,925
Net Unrealized Gains (Losses) on AFS Fixed Maturity Securities with OTTI Pre-Tax      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Beginning balance 0 0 1,568
Net unrealized investment gains (losses) on investments arising during period 0 0 0
Reclassification adjustment for (gains) losses included in net income 0 0 0
Reclassification due to implementation of ASU 2016-13     (1,568)
Reclassification due to allowance for credit losses recorded during the period 0 0 0
Impact of net unrealized investment (gains) losses 0 0 0
Ending balance $ 0 $ 0 $ 0