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Significant Accounting Policies and Pronouncements (Changes to the presentation within the Consolidated Statements of Financial Position) (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Jan. 01, 2018
Dec. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Fixed maturities, available-for-sale: $ 9,771,673   $ 10,110,786
Fixed maturities, trading, at fair value 289,752   166,360
Trading account asses, at fair value     0
Equity securities, available-for-sale, at fair value     0
Equity securities, at fair value 20,613   15,375
Commercial mortgage and other loans 1,353,478   1,387,012
Policy loans 12,805   12,558
Short-term investments 37,568   711,071
Other long-term investments     0
Other invested assets 348,541   335,811
Total investments $ 11,834,430   12,738,973
As previously reported      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Fixed maturities, available-for-sale:     10,110,786
Fixed maturities, trading, at fair value     0
Trading account asses, at fair value     181,717
Equity securities, available-for-sale, at fair value     18
Equity securities, at fair value     0
Commercial mortgage and other loans     1,387,012
Policy loans     12,558
Short-term investments     711,071
Other long-term investments     335,811
Other invested assets     0
Total investments     12,738,973
Reclassifications (1) | ASU 2016-01      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Equity securities, available-for-sale, at fair value     (18)
Equity securities, at fair value     18
Other invested assets   $ 423  
Total investments     0
Reclassifications (2) | ASU 2016-01      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Fixed maturities, trading, at fair value     166,360
Trading account asses, at fair value     (181,717)
Equity securities, at fair value     15,357
Total investments     0
Reclassifications (3) | ASU 2016-01      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Other long-term investments     (335,811)
Other invested assets     335,811
Total investments     $ 0