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Equity (OTTI Net Unrealized Investment Gains (Losses) in AOCI (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Accumulated Other Comprehensive Income (Loss)      
Beginning balance $ 64,805    
Ending balance 70,975 $ 64,805  
Accumulated Other Comprehensive Income (Loss) Related To Net Unrealized Investment Gains (Losses)      
Accumulated Other Comprehensive Income (Loss)      
Beginning balance 65,202 178,758 $ 56,243
Ending balance 71,377 65,202 178,758
OTTI | Net Unrealized Gains (Losses) on Investments      
Accumulated Other Comprehensive Income (Loss)      
Beginning balance 5,196 5,333 4,498
Net investment gains (losses) on investments arising during the period 1,238 107 996
Reclassification adjustment for (gains) losses included in net income (1,107) (251) (161)
Reclassification adjustment for OTTI losses excluded from net income (444) 7 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 0 0 0
Ending balance 4,883 5,196 5,333
OTTI | Deferred Policy Acquisition Costs and Other Costs      
Accumulated Other Comprehensive Income (Loss)      
Beginning balance (1,350) (2,538) (3,324)
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 (209) 1,188 786
Impact of net unrealized investment (gains) losses on future policy benefits 0 0 0
Ending balance (1,559) (1,350) (2,538)
OTTI | Future Policy Benefits and Policyholders' Account Balances      
Accumulated Other Comprehensive Income (Loss)      
Beginning balance 1,114 1,228 1,819
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 165 (114) (591)
Ending balance 1,279 1,114 1,228
OTTI | Deferred Income Tax (Liability) Benefit      
Accumulated Other Comprehensive Income (Loss)      
Beginning balance (1,767) (1,440) (1,079)
Net investment gains (losses) on investments arising during the period (433) (37) (348)
Reclassification adjustment for (gains) losses included in net income 387 88 56
Reclassification adjustment for OTTI losses excluded from net income 155 (2) 0
Impact of net unrealized investment (gains) losses on deferred policy acquisition costs and other costs 73 (416) (275)
Impact of net unrealized investment (gains) losses on future policy benefits (58) 40 206
Ending balance (1,643) (1,767) (1,440)
OTTI | Accumulated Other Comprehensive Income (Loss) Related To Net Unrealized Investment Gains (Losses)      
Accumulated Other Comprehensive Income (Loss)      
Beginning balance 3,193 2,583 1,914
Net investment gains (losses) on investments arising during the period 805 70 648
Reclassification adjustment for (gains) losses included in net income (720) (163) (105)
Reclassification adjustment for OTTI losses excluded from net income (289) 5 0
Impact of net unrealized investment (gains) losses on deferred policy acquisition costs and other costs (136) 772 511
Impact of net unrealized investment (gains) losses on future policy benefits 107 (74) (385)
Ending balance $ 2,960 $ 3,193 $ 2,583