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Equity (All Other Net Unrealized Investment Gains (Losses) in AOCI) (Details)
$ in Thousands
6 Months Ended
Jun. 30, 2017
USD ($)
Accumulated Other Comprehensive Income (Loss) [Line Items]  
Beginning balance $ (314,948)
Ending balance (161,922)
Accumulated Other Comprehensive Income (Loss) Related to Net Unrealized Investment Gains (Losses)  
Accumulated Other Comprehensive Income (Loss) [Line Items]  
Beginning balance (314,870)
Ending balance (161,886)
All Other | Net Unrealized Gains (Losses) on Investments  
Accumulated Other Comprehensive Income (Loss) [Line Items]  
Beginning balance (442,314)
Net investment gains (losses) on investments arising during the period 281,087
Reclassification adjustment for (gains) losses included in net income (3,770)
Reclassification adjustment for OTTI (gains) losses excluded from net income (61)
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 (165,058)
All Other | Deferred Policy Acquisition Costs and Other Costs  
Accumulated Other Comprehensive Income (Loss) [Line Items]  
Beginning balance (31,251)
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 (37,422)
Impact of net unrealized investment (gains) losses on future policy benefits and other liabilities 0
Ending balance (68,673)
All Other | Future Policy Benefits and Other Liabilities  
Accumulated Other Comprehensive Income (Loss) [Line Items]  
Beginning balance (5,664)
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 (7,953)
Ending balance (13,617)
All Other | Deferred Income Tax (Liability) Benefit  
Accumulated Other Comprehensive Income (Loss) [Line Items]  
Beginning balance 166,888
Net investment gains (losses) on investments arising during the period (98,382)
Reclassification adjustment for (gains) losses included in net income 1,320
Reclassification adjustment for OTTI (gains) losses excluded from net income 21
Impact of net unrealized investment (gains) losses on deferred policy acquisition costs and other costs 13,098
Impact of net unrealized investment (gains) losses on future policy benefits and other liabilities 2,783
Ending balance 85,728
All Other | Accumulated Other Comprehensive Income (Loss) Related to Net Unrealized Investment Gains (Losses)  
Accumulated Other Comprehensive Income (Loss) [Line Items]  
Beginning balance (312,341)
Net investment gains (losses) on investments arising during the period 182,705
Reclassification adjustment for (gains) losses included in net income (2,450)
Reclassification adjustment for OTTI (gains) losses excluded from net income (40)
Impact of net unrealized investment (gains) losses on deferred policy acquisition costs and other costs (24,324)
Impact of net unrealized investment (gains) losses on future policy benefits and other liabilities (5,170)
Ending balance $ (161,620)