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Equity (OTTI Net Unrealized Investment Gains (Losses) in AOCI) (Details)
$ in Thousands
6 Months Ended
Jun. 30, 2018
USD ($)
Accumulated Other Comprehensive Income (Loss) [Line Items]  
Beginning balance $ (90,124)
Ending balance (312,842)
Accumulated Other Comprehensive Income (Loss) Related to Net Unrealized Investment Gains (Losses)  
Accumulated Other Comprehensive Income (Loss) [Line Items]  
Beginning balance (90,117)
Ending balance (311,942)
OTTI | Net Unrealized Gains (Losses) on Investments  
Accumulated Other Comprehensive Income (Loss) [Line Items]  
Beginning balance 12,311
Net investment gains (losses) on investments arising during the period (11,749)
Reclassification adjustment for (gains) losses included in net income 38
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 other liabilities 0
Ending balance 600
OTTI | Deferred Policy Acquisition Costs and Other Costs  
Accumulated Other Comprehensive Income (Loss) [Line Items]  
Beginning balance (1,008)
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 (3)
Impact of net unrealized investment (gains) losses on future policy benefits and other liabilities 0
Ending balance (1,011)
OTTI | Future Policy Benefits and Other Liabilities  
Accumulated Other Comprehensive Income (Loss) [Line Items]  
Beginning balance (157)
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 other liabilities 4
Ending balance (153)
OTTI | Deferred Income Tax (Liability) Benefit  
Accumulated Other Comprehensive Income (Loss) [Line Items]  
Beginning balance (3,263)
Net investment gains (losses) on investments arising during the period 2,467
Reclassification adjustment for (gains) losses included in net income (8)
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 1
Impact of net unrealized investment (gains) losses on future policy benefits and other liabilities (1)
Ending balance (804)
OTTI | Accumulated Other Comprehensive Income (Loss) Related to Net Unrealized Investment Gains (Losses)  
Accumulated Other Comprehensive Income (Loss) [Line Items]  
Beginning balance 7,883
Net investment gains (losses) on investments arising during the period (9,282)
Reclassification adjustment for (gains) losses included in net income 30
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 (2)
Impact of net unrealized investment (gains) losses on future policy benefits and other liabilities 3
Ending balance $ (1,368)