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Equity (All Other Net Unrealized Investment Gains and 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
All Other | Net Unrealized Gains (Losses) on Investments      
Accumulated Other Comprehensive Income (Loss)      
Beginning balance 111,837 344,577 123,153
Net investment gains (losses) on investments arising during the period (70,379) (223,082) 239,912
Reclassification adjustment for (gains) losses included in net income 65,647 (9,651) (18,488)
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 107,549 111,837 344,577
All Other | Deferred Policy Acquisition Costs and Other Costs      
Accumulated Other Comprehensive Income (Loss)      
Beginning balance (19,252) (112,829) (43,030)
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 2,017 93,577 (69,799)
Impact of net unrealized investment (gains) losses on future policy benefits 0 0 0
Ending balance (17,235) (19,252) (112,829)
All Other | Future Policy Benefits and Policyholders' Account Balances      
Accumulated Other Comprehensive Income (Loss)      
Beginning balance 2,647 39,122 3,293
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 12,127 (36,475) 35,829
Ending balance 14,774 2,647 39,122
All Other | Deferred Income Tax (Liability) Benefit      
Accumulated Other Comprehensive Income (Loss)      
Beginning balance (33,223) (94,695) (29,087)
Net investment gains (losses) on investments arising during the period 24,633 78,078 (83,969)
Reclassification adjustment for (gains) losses included in net income (22,976) 3,378 6,471
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 (706) (32,752) 24,430
Impact of net unrealized investment (gains) losses on future policy benefits (4,244) 12,766 (12,540)
Ending balance (36,671) (33,223) (94,695)
All Other | Accumulated Other Comprehensive Income (Loss) Related To Net Unrealized Investment Gains (Losses)      
Accumulated Other Comprehensive Income (Loss)      
Beginning balance 62,009 176,175 54,329
Net investment gains (losses) on investments arising during the period (45,746) (145,004) 155,943
Reclassification adjustment for (gains) losses included in net income 42,671 (6,273) (12,017)
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 1,311 60,825 (45,369)
Impact of net unrealized investment (gains) losses on future policy benefits 7,883 (23,709) 23,289
Ending balance $ 68,417 $ 62,009 $ 176,175