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Equity (All Other Net Unrealized Investment Gains (Losses) in AOCI) (Details)
$ in Thousands
9 Months Ended
Sep. 30, 2018
USD ($)
Accumulated Other Comprehensive Income (Loss) [Line Items]  
Beginning Balance $ 165,346
Ending Balance (20,750)
Accumulated Other Comprehensive Income (Loss) Related To Net Unrealized Investment Gains (Losses)  
Accumulated Other Comprehensive Income (Loss) [Line Items]  
Beginning Balance 165,580
Ending Balance (10,686)
All Other | Net Unrealized Gains (Losses) on Investments  
Accumulated Other Comprehensive Income (Loss) [Line Items]  
Beginning Balance 272,809
Net investment gains (losses) on investments arising during the period (278,583)
Reclassification adjustment for (gains) losses included in net income (5,093)
Reclassification adjustment for OTTI (gains) losses excluded from net income 128
Impact of net unrealized investment (gains) losses on deferred policy acquisition costs and other costs 0
Impact of net unrealized investment (gains) losses on future policy benefits and policyholders' account balances 0
Ending Balance (13,107)
All Other | Deferred Policy Acquisition Costs and Other Costs  
Accumulated Other Comprehensive Income (Loss) [Line Items]  
Beginning Balance 1,832
Net investment gains (losses) on investments arising during the period 0
Reclassification adjustment for (gains) losses included in net income 0
Reclassification adjustment for OTTI (gains) losses excluded from net income 0
Impact of net unrealized investment (gains) losses on deferred policy acquisition costs and other costs (49,664)
Impact of net unrealized investment (gains) losses on future policy benefits and policyholders' account balances 0
Ending Balance (47,832)
All Other | Future Policy Benefits and Policyholders’ Account Balances  
Accumulated Other Comprehensive Income (Loss) [Line Items]  
Beginning Balance (28,998)
Net investment gains (losses) on investments arising during the period 0
Reclassification adjustment for (gains) losses included in net income 0
Reclassification adjustment for OTTI (gains) losses excluded from net income 0
Impact of net unrealized investment (gains) losses on deferred policy acquisition costs and other costs 0
Impact of net unrealized investment (gains) losses on future policy benefits and policyholders' account balances 75,323
Ending Balance 46,325
All Other | Deferred Income Tax (Liability) Benefit  
Accumulated Other Comprehensive Income (Loss) [Line Items]  
Beginning Balance (80,913)
Net investment gains (losses) on investments arising during the period 58,504
Reclassification adjustment for (gains) losses included in net income 1,070
Reclassification adjustment for OTTI (gains) losses excluded from net income 0
Impact of net unrealized investment (gains) losses on deferred policy acquisition costs and other costs 10,431
Impact of net unrealized investment (gains) losses on future policy benefits and policyholders' account balances (15,819)
Ending Balance 4,601
All Other | Accumulated Other Comprehensive Income (Loss) Related To Net Unrealized Investment Gains (Losses)  
Accumulated Other Comprehensive Income (Loss) [Line Items]  
Beginning Balance 164,730
Net investment gains (losses) on investments arising during the period (220,079)
Reclassification adjustment for (gains) losses included in net income (4,023)
Reclassification adjustment for OTTI (gains) losses excluded from net income 128
Impact of net unrealized investment (gains) losses on deferred policy acquisition costs and other costs (39,233)
Impact of net unrealized investment (gains) losses on future policy benefits and policyholders' account balances 59,504
Ending Balance (10,013)
ASU 2016-01 | Accumulated Other Comprehensive Income (Loss) Related To Net Unrealized Investment Gains (Losses)  
Accumulated Other Comprehensive Income (Loss) [Line Items]  
Cumulative effect of adoption (1,539)
ASU 2016-01 | All Other | Net Unrealized Gains (Losses) on Investments  
Accumulated Other Comprehensive Income (Loss) [Line Items]  
Cumulative effect of adoption (2,368)
ASU 2016-01 | All Other | Deferred Policy Acquisition Costs and Other Costs  
Accumulated Other Comprehensive Income (Loss) [Line Items]  
Cumulative effect of adoption 0
ASU 2016-01 | All Other | Future Policy Benefits and Policyholders’ Account Balances  
Accumulated Other Comprehensive Income (Loss) [Line Items]  
Cumulative effect of adoption 0
ASU 2016-01 | All Other | Deferred Income Tax (Liability) Benefit  
Accumulated Other Comprehensive Income (Loss) [Line Items]  
Cumulative effect of adoption 829
ASU 2016-01 | All Other | Accumulated Other Comprehensive Income (Loss) Related To Net Unrealized Investment Gains (Losses)  
Accumulated Other Comprehensive Income (Loss) [Line Items]  
Cumulative effect of adoption (1,539)
ASU 2018-02  
Accumulated Other Comprehensive Income (Loss) [Line Items]  
Ending Balance 30,400
ASU 2018-02 | Accumulated Other Comprehensive Income (Loss) Related To Net Unrealized Investment Gains (Losses)  
Accumulated Other Comprehensive Income (Loss) [Line Items]  
Cumulative effect of adoption 30,499
ASU 2018-02 | All Other | Net Unrealized Gains (Losses) on Investments  
Accumulated Other Comprehensive Income (Loss) [Line Items]  
Cumulative effect of adoption 0
ASU 2018-02 | All Other | Deferred Policy Acquisition Costs and Other Costs  
Accumulated Other Comprehensive Income (Loss) [Line Items]  
Cumulative effect of adoption 0
ASU 2018-02 | All Other | Future Policy Benefits and Policyholders’ Account Balances  
Accumulated Other Comprehensive Income (Loss) [Line Items]  
Cumulative effect of adoption 0
ASU 2018-02 | All Other | Deferred Income Tax (Liability) Benefit  
Accumulated Other Comprehensive Income (Loss) [Line Items]  
Cumulative effect of adoption 30,499
ASU 2018-02 | All Other | Accumulated Other Comprehensive Income (Loss) Related To Net Unrealized Investment Gains (Losses)  
Accumulated Other Comprehensive Income (Loss) [Line Items]  
Cumulative effect of adoption $ 30,499