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Equity (All Other 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) [Line Items]      
Beginning Balance $ 46,166    
Ending Balance (314,948) $ 46,166  
All Other | Net Unrealized Gains (Losses) on Investments      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning Balance 107,451 198,922 $ 184,727
Net investment gains (losses) on investments arising during the period (637,597) (86,623) 28,590
Reclassification adjustment for (gains) losses included in net income 85,628 (4,848) (14,395)
Reclassification adjustment for (gains) losses excluded from net income 2,204    
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 (442,314) 107,451 198,922
All Other | Deferred Policy Acquisition Costs and Other Costs      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning Balance (30,465) (59,045) (66,452)
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 (gains) losses excluded from net income 0    
Impact of net unrealized investment (gains) losses on deferred policy acquisition costs and other costs (786) 28,580 7,407
Impact of net unrealized investment (gains) losses on future policy benefits 0 0 0
Ending Balance (31,251) (30,465) (59,045)
All Other | Future Policy Benefits      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning Balance (4,596) (8,372) (8,187)
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 (gains) losses excluded from net income 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 (1,068) 3,776 (185)
Ending Balance (5,664) (4,596) (8,372)
All Other | Deferred Income Tax (Liability) Benefit      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning Balance (26,179) (46,870) (39,363)
Net investment gains (losses) on investments arising during the period 223,159 30,319 (10,013)
Reclassification adjustment for (gains) losses included in net income (29,970) 1,697 5,036
Reclassification adjustment for (gains) losses excluded from net income (771)    
Impact of net unrealized investment (gains) losses on deferred policy acquisition costs and other costs 275 (10,003) (2,594)
Impact of net unrealized investment (gains) losses on future policy benefits 374 (1,322) 64
Ending Balance 166,888 (26,179) (46,870)
All Other | Accumulated Other Comprehensive Income (Loss) Related To Net Unrealized Investment Gains (Losses)      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning Balance 46,211 84,635 70,725
Net investment gains (losses) on investments arising during the period (414,438) (56,304) 18,577
Reclassification adjustment for (gains) losses included in net income 55,658 (3,151) (9,359)
Reclassification adjustment for (gains) losses excluded from net income 1,433    
Impact of net unrealized investment (gains) losses on deferred policy acquisition costs and other costs (511) 18,577 4,813
Impact of net unrealized investment (gains) losses on future policy benefits (694) 2,454 (121)
Ending Balance $ (312,341) $ 46,211 $ 84,635