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Equity (OTTI Net Unrealized Investment Gains (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
OTTI | Net Unrealized Gains (Losses) on Investments      
Accumulated Other Comprehensive Income (Loss)      
Beginning balance 4,883 5,196 5,333
Net investment gains (losses) on investments arising during the period 375 1,238 107
Reclassification adjustment for (gains) losses included in net income (3,699) (1,107) (251)
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 1,609 4,883 5,196
OTTI | Deferred Policy Acquisition Costs, Reinsurance Recoverable and Other Costs      
Accumulated Other Comprehensive Income (Loss)      
Beginning balance (912) (1,305) (2,709)
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) 813 393 1,404
Impact of net unrealized investment (gains) losses on future policy benefits, policyholders' account balances and reinsurance payables 0 0 0
Ending balance (99) (912) (1,305)
OTTI | Future Policy Benefits and Policyholders' Account Balances      
Accumulated Other Comprehensive Income (Loss)      
Beginning balance 632 1,069 1,399
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 (610) (437) (330)
Ending balance 22 632 1,069
OTTI | Deferred Income Tax (Liability) Benefit      
Accumulated Other Comprehensive Income (Loss)      
Beginning balance (1,643) (1,767) (1,440)
Net investment gains (losses) on investments arising during the period (119) (433) (37)
Reclassification adjustment for (gains) losses included in net income 1,171 387 88
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) (289) (138) (492)
Impact of net unrealized investment (gains) losses on future policy benefits, policyholders' account balances and reinsurance payables 214 153 116
Ending balance (682) (1,643) (1,767)
OTTI | Accumulated Other Comprehensive Income (Loss) Related To Net Unrealized Investment Gains (Losses)      
Accumulated Other Comprehensive Income (Loss)      
Beginning balance 2,960 3,193 2,583
Net investment gains (losses) on investments arising during the period 256 805 70
Reclassification adjustment for (gains) losses included in net income (2,528) (720) (163)
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) 524 255 912
Impact of net unrealized investment (gains) losses on future policy benefits, policyholders' account balances and reinsurance payables (396) (284) (214)
Ending balance $ 850 $ 2,960 $ 3,193