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Equity (All Other Net Unrealized Investment Gains and Losses in AOCI) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Accumulated Other Comprehensive Income (Loss)      
Beginning balance $ 70,975    
Ending balance 165,346 $ 70,975  
Accumulated Other Comprehensive Income (Loss) Related To Net Unrealized Investment Gains (Losses)      
Accumulated Other Comprehensive Income (Loss)      
Beginning balance 71,377 65,202 $ 178,758
Ending balance 165,580 71,377 65,202
All Other | Net Unrealized Gains (Losses) on Investments      
Accumulated Other Comprehensive Income (Loss)      
Beginning balance 107,549 111,837 344,577
Net investment gains (losses) on investments arising during the period 134,613 (70,379) (223,082)
Reclassification adjustment for (gains) losses included in net income (30,697) (65,647) 9,651
Reclassification adjustment for OTTI losses excluded from net income (50) 444 (7)
Impact of net unrealized investment (gains) losses on deferred policy acquisition costs, reinsurance recoverable and deferred sales inducements(2) 0 0 0
Impact of net unrealized investment (gains) losses on future policy benefits, policyholders' account balances and reinsurance payables 0 0 0
Ending balance 272,809 107,549 111,837
All Other | Deferred Policy Acquisition Costs, Reinsurance Recoverable and Other Costs      
Accumulated Other Comprehensive Income (Loss)      
Beginning balance (96,752) (96,620) (256,260)
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, reinsurance recoverable and deferred sales inducements(2) 98,584 (132) 159,640
Impact of net unrealized investment (gains) losses on future policy benefits, policyholders' account balances and reinsurance payables 0 0 0
Ending balance 1,832 (96,752) (96,620)
All Other | Future Policy Benefits and Policyholders' Account Balances      
Accumulated Other Comprehensive Income (Loss)      
Beginning balance 94,291 80,015 182,553
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, reinsurance recoverable and deferred sales inducements(2) 0 0 0
Impact of net unrealized investment (gains) losses on future policy benefits, policyholders' account balances and reinsurance payables (123,289) 14,276 (102,538)
Ending balance (28,998) 94,291 80,015
All Other | Deferred Income Tax (Liability) Benefit      
Accumulated Other Comprehensive Income (Loss)      
Beginning balance (36,671) (33,223) (94,695)
Net investment gains (losses) on investments arising during the period (42,628) 24,633 78,078
Reclassification adjustment for (gains) losses included in net income 9,721 22,976 (3,378)
Reclassification adjustment for OTTI losses excluded from net income 16 (155) 2
Impact of net unrealized investment (gains) losses on deferred policy acquisition costs, reinsurance recoverable and deferred sales inducements(2) (35,060) 46 (55,874)
Impact of net unrealized investment (gains) losses on future policy benefits, policyholders' account balances and reinsurance payables 43,151 (4,996) 35,888
Ending balance (80,913) (36,671) (33,223)
All Other | Accumulated Other Comprehensive Income (Loss) Related To Net Unrealized Investment Gains (Losses)      
Accumulated Other Comprehensive Income (Loss)      
Beginning balance 68,417 62,009 176,175
Net investment gains (losses) on investments arising during the period 91,985 (45,746) (145,004)
Reclassification adjustment for (gains) losses included in net income (20,976) (42,671) 6,273
Reclassification adjustment for OTTI losses excluded from net income (34) 289 (5)
Impact of net unrealized investment (gains) losses on deferred policy acquisition costs, reinsurance recoverable and deferred sales inducements(2) 63,524 (86) 103,766
Impact of net unrealized investment (gains) losses on future policy benefits, policyholders' account balances and reinsurance payables (80,138) 9,280 (66,650)
Ending balance $ 164,730 $ 68,417 $ 62,009