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Significant Accounting Policies and Pronouncements (Changes to the presentation within the Consolidated Statements of Financial Position) (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Jan. 01, 2018
Dec. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Fixed maturities, available-for-sale $ 9,322,358   $ 10,110,786
Fixed maturities, trading, at fair value [1] 261,226   166,360
Trading account assets, at fair value     0
Equity securities, available-for-sale, at fair value     0
Equity securities, at fair value [1] 13,164   15,375
Commercial mortgage and other loans 1,352,403   1,387,012
Policy loans 12,656   12,558
Short-term investments     711,071
Other long-term investments     0
Other invested assets [1] 254,050   335,811
Total investments $ 11,236,542   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 assets, 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 assets, 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
[1] (1)Prior period amounts have been reclassified to conform to current period presentation. See "Adoption of ASU 2016-01" in Note 2 for details.