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Deferred Policy Acquisition Costs, Deferred Sales Inducements and Liability for Lifetime Income Benefit Riders (Liability for Lifetime Income Benefit Riders) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Liability for Future Policy Benefit, by Product Segment [Line Items]      
Balance at beginning of year $ 56,142,673    
Balance at end of year 57,606,009 $ 56,142,673  
Liability for Lifetime Income Benefit Riders      
Liability for Future Policy Benefit, by Product Segment [Line Items]      
Balance at beginning of year 704,441 533,391 $ 351,946
Benefit expense accrual 157,333 149,442 139,443
Impact of unlocking (53,607) 21,608 42,002
Claim payments 0 0 0
Balance at end of year $ 808,167 $ 704,441 $ 533,391