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Equity (All Other 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) [Line Items]      
Beginning Balance $ (314,948)    
Ending Balance (90,124) $ (314,948)  
All Other | Net Unrealized Gains (Losses) on Investments      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning Balance (442,314) 107,451 $ 198,922
Net investment gains (losses) on investments arising during the period 376,012 (637,597) (86,623)
Reclassification adjustment for (gains) losses included in net income (5,349) 85,628 (4,848)
Reclassification adjustment for OTTI losses excluded from net income (72) 2,204 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 (71,723) (442,314) 107,451
All Other | Deferred Policy Acquisition Costs and Other Costs      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning Balance (31,251) (30,465) (59,045)
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 (50,961) (786) 28,580
Impact of net unrealized investment (gains) losses on future policy benefits 0 0 0
Ending Balance (82,212) (31,251) (30,465)
All Other | Future Policy Benefits and Other Liabilities      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning Balance (5,664) (4,596) (8,372)
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 (11,333) (1,068) 3,776
Ending Balance (16,997) (5,664) (4,596)
All Other | Deferred Income Tax (Liability) Benefit      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning Balance 166,888 (26,179) (46,870)
Net investment gains (losses) on investments arising during the period (115,538) 223,159 30,319
Reclassification adjustment for (gains) losses included in net income 1,644 (29,970) 1,697
Reclassification adjustment for OTTI losses excluded from net income 22 (771) 0
Impact of net unrealized investment (gains) losses on deferred policy acquisition costs and other costs 15,949 275 (10,003)
Impact of net unrealized investment (gains) losses on future policy benefits 3,967 374 (1,322)
Ending Balance 72,932 166,888 (26,179)
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) 46,211 84,635
Net investment gains (losses) on investments arising during the period 260,474 (414,438) (56,304)
Reclassification adjustment for (gains) losses included in net income (3,705) 55,658 (3,151)
Reclassification adjustment for OTTI losses excluded from net income (50) 1,433 0
Impact of net unrealized investment (gains) losses on deferred policy acquisition costs and other costs (35,012) (511) 18,577
Impact of net unrealized investment (gains) losses on future policy benefits (7,366) (694) 2,454
Ending Balance $ (98,000) $ (312,341) $ 46,211