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Equity (All Other Net Unrealized Investment Gains (Losses) in AOCI) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning Balance $ (90,124)    
Ending Balance (324,373) $ (90,124)  
Accumulated Other Comprehensive Income (Loss) Related To Net Unrealized Investment Gains (Losses)      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning Balance (90,117) (314,870) $ 46,231
Ending Balance (323,295) (90,117) (314,870)
All Other | Accumulated Net Unrealized Investment Gain (Loss) Pre Tax [Member]      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning Balance (71,723) (442,314) 107,451
Net investment gains (losses) on investments arising during the period (405,264) 376,012 (637,597)
Reclassification adjustment for (gains) losses included in net income 63,175 (5,349) 85,628
Reclassification adjustment for OTTI losses excluded from net income 241 (72) 2,204
Impact of net unrealized investment (gains) losses on deferred policy acquisition costs and other costs 0 0 0
Impact of net unrealized investment (gains) losses on future policy benefits 0 0 0
Ending Balance (413,575) (71,723) (442,314)
All Other | Deferred Costs Policy Acquisition And Sales Inducements And Valuation Of Business Acquired, Pre Tax [Member]      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning Balance (82,212) (31,251) (30,465)
Net investment gains (losses) on investments arising during the 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 0 0
Impact of net unrealized investment (gains) losses on deferred policy acquisition costs and other costs 90,717 (50,961) (786)
Impact of net unrealized investment (gains) losses on future policy benefits 0 0 0
Ending Balance 8,505 (82,212) (31,251)
All Other | Policyholders Account Balances Pre Tax      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning Balance (16,997) (5,664) (4,596)
Net investment gains (losses) on investments arising during the 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 0 0
Impact of net unrealized investment (gains) losses on deferred policy acquisition costs and other costs 0 0 0
Impact of net unrealized investment (gains) losses on future policy benefits 18,110 (11,333) (1,068)
Ending Balance 1,113 (16,997) (5,664)
All Other | Deferred Income Tax (Liability) Benefit      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning Balance 72,932 166,888 (26,179)
Net investment gains (losses) on investments arising during the period 85,105 (115,538) 223,159
Reclassification adjustment for (gains) losses included in net income (13,267) 1,644 (29,970)
Reclassification adjustment for OTTI losses excluded from net income (51) 22 (771)
Impact of net unrealized investment (gains) losses on deferred policy acquisition costs and other costs (19,049) 15,949 275
Impact of net unrealized investment (gains) losses on future policy benefits (3,803) 3,967 374
Ending Balance 85,156 72,932 166,888
All Other | Accumulated Other Comprehensive Income (Loss) Related To Net Unrealized Investment Gains (Losses)      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning Balance (98,000) (312,341) 46,211
Net investment gains (losses) on investments arising during the period (320,159) 260,474 (414,438)
Reclassification adjustment for (gains) losses included in net income 49,908 (3,705) 55,658
Reclassification adjustment for OTTI losses excluded from net income 190 (50) 1,433
Impact of net unrealized investment (gains) losses on deferred policy acquisition costs and other costs 71,668 (35,012) (511)
Impact of net unrealized investment (gains) losses on future policy benefits 14,307 (7,366) (694)
Ending Balance (318,801) $ (98,000) $ (312,341)
ASU 2016-01 | Accumulated Other Comprehensive Income (Loss) Related To Net Unrealized Investment Gains (Losses)      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Cumulative Effect of New Accounting Principle in Period of Adoption (3)    
ASU 2016-01 | All Other | Accumulated Net Unrealized Investment Gain (Loss) Pre Tax [Member]      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Cumulative Effect of New Accounting Principle in Period of Adoption (4)    
ASU 2016-01 | All Other | Deferred Costs Policy Acquisition And Sales Inducements And Valuation Of Business Acquired, Pre Tax [Member]      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Cumulative Effect of New Accounting Principle in Period of Adoption 0    
ASU 2016-01 | All Other | Policyholders Account Balances Pre Tax      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Cumulative Effect of New Accounting Principle in Period of Adoption 0    
ASU 2016-01 | All Other | Deferred Income Tax (Liability) Benefit      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Cumulative Effect of New Accounting Principle in Period of Adoption 1    
ASU 2016-01 | All Other | Accumulated Other Comprehensive Income (Loss) Related To Net Unrealized Investment Gains (Losses)      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Cumulative Effect of New Accounting Principle in Period of Adoption (3)    
ASU 2018-02 | Accumulated Other Comprehensive Income (Loss) Related To Net Unrealized Investment Gains (Losses)      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Cumulative Effect of New Accounting Principle in Period of Adoption (36,712)    
ASU 2018-02 | All Other | Accumulated Net Unrealized Investment Gain (Loss) Pre Tax [Member]      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Cumulative Effect of New Accounting Principle in Period of Adoption 0    
ASU 2018-02 | All Other | Deferred Costs Policy Acquisition And Sales Inducements And Valuation Of Business Acquired, Pre Tax [Member]      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Cumulative Effect of New Accounting Principle in Period of Adoption 0    
ASU 2018-02 | All Other | Policyholders Account Balances Pre Tax      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Cumulative Effect of New Accounting Principle in Period of Adoption 0    
ASU 2018-02 | All Other | Deferred Income Tax (Liability) Benefit      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Cumulative Effect of New Accounting Principle in Period of Adoption (36,712)    
ASU 2018-02 | All Other | Accumulated Other Comprehensive Income (Loss) Related To Net Unrealized Investment Gains (Losses)      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Cumulative Effect of New Accounting Principle in Period of Adoption $ (36,712)