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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, 2021
Dec. 31, 2020
Dec. 31, 2019
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Beginning balance $ 546,128    
Ending balance 347,435 $ 546,128  
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 1,568 $ (689)
Net unrealized investment gains (losses) on investments arising during period 0 0 2,112
Reclassification adjustment for (gains) losses included in net income 0 0 210
Reclassification adjustment for OTTI losses excluded from net income     (65)
Reclassification due to implementation of ASU 2016-13   (1,568)  
Reclassification due to allowance for credit losses recorded during the period 0 0  
Impact of net unrealized investment (gains) losses 0 0 0
Ending balance 0 0 1,568
Accumulated Net Unrealized Investment Gains (Losses) Pre-Tax with Allowance      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Beginning balance 0 0 0
Net unrealized investment gains (losses) on investments arising during period 2,951 616 0
Reclassification adjustment for (gains) losses included in net income (8) 0 0
Reclassification adjustment for OTTI losses excluded from net income     0
Reclassification due to implementation of ASU 2016-13   0  
Reclassification due to allowance for credit losses recorded during the period 742 (616)  
Impact of net unrealized investment (gains) losses 0 0 0
Ending balance 3,685 0 0
Accumulated Net Unrealized Investment Gains (Losses) Pre Tax All Other      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Beginning balance 849,349 423,612 (16,632)
Net unrealized investment gains (losses) on investments arising during period (240,917) 416,479 494,861
Reclassification adjustment for (gains) losses included in net income (24,986) 7,074 (54,682)
Reclassification adjustment for OTTI losses excluded from net income     65
Reclassification due to implementation of ASU 2016-13   1,568  
Reclassification due to allowance for credit losses recorded during the period (742) 616  
Impact of net unrealized investment (gains) losses 0 0 0
Ending balance 582,704 849,349 423,612
Deferred Policy Acquisition Costs and Other Costs      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Beginning balance 1,200,048 423,227 (65,895)
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 adjustment for OTTI losses excluded from net income     0
Reclassification due to implementation of ASU 2016-13   0  
Reclassification due to allowance for credit losses recorded during the period 0 0  
Impact of net unrealized investment (gains) losses (216,963) 776,821 489,122
Ending balance 983,085 1,200,048 423,227
Future Policy Benefits and Policyholders' Account Balances and Other Liabilities      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Beginning balance (1,348,231) (482,134) 68,042
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 adjustment for OTTI losses excluded from net income     0
Reclassification due to implementation of ASU 2016-13   0  
Reclassification due to allowance for credit losses recorded during the period 0 0  
Impact of net unrealized investment (gains) losses 232,747 (866,097) (550,176)
Ending balance (1,115,484) (1,348,231) (482,134)
Income Tax Benefit (Expense)      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Beginning balance (147,241) (76,914) 4,326
Net unrealized investment gains (losses) on investments arising during period 50,016 (87,588) (105,845)
Reclassification adjustment for (gains) losses included in net income 5,277 (1,486) 11,601
Reclassification adjustment for OTTI losses excluded from net income     0
Reclassification due to implementation of ASU 2016-13   0  
Reclassification due to allowance for credit losses recorded during the period 0 0  
Impact of net unrealized investment (gains) losses (3,333) 18,747 13,004
Ending balance (95,281) (147,241) (76,914)
Accumulated Other Comprehensive Income (Loss) Related to Net Unrealized Investment Gains (Losses)      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Beginning balance 553,925 289,359 (10,848)
Net unrealized investment gains (losses) on investments arising during period (187,950) 329,507 391,128
Reclassification adjustment for (gains) losses included in net income (19,717) 5,588 (42,871)
Reclassification adjustment for OTTI losses excluded from net income     0
Reclassification due to implementation of ASU 2016-13   0  
Reclassification due to allowance for credit losses recorded during the period 0 0  
Impact of net unrealized investment (gains) losses 12,451 (70,529) (48,050)
Ending balance $ 358,709 $ 553,925 $ 289,359