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Significant Accounting Policies and Pronouncements (Changes to the presentation within the Consolidated Statement 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 $ 5,234,708   $ 5,223,302
Fixed maturities, trading, at fair value [1] 36,688   38,793
Equity securities, available for sale, at fair value     0
Equity securities, at fair value [1] 43,545   40,610
Trading account assets, at fair value     0
Policy loans 1,217,608   1,161,101
Short-term investments 456   1,339
Commercial mortgage and other loans 1,177,395   1,083,419
Other Long-term Investments     0
Other invested assets [1] 333,382   263,074
Total investments $ 8,043,782   7,811,638
As previously reported      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Fixed maturities, available-for-sale     5,223,302
Fixed maturities, trading, at fair value     0
Equity securities, available for sale, at fair value     23,122
Equity securities, at fair value     0
Trading account assets, at fair value     56,281
Policy loans     1,161,101
Short-term investments     1,339
Commercial mortgage and other loans     1,083,419
Other Long-term Investments     263,074
Other invested assets     0
Total investments     7,811,638
Reclassification (1) | ASU 2016-01      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Equity securities, available for sale, at fair value     (23,122)
Equity securities, at fair value     23,122
Other invested assets   $ 8,097  
Total investments     0
Reclassification (2) | ASU 2016-01      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Fixed maturities, trading, at fair value     38,793
Equity securities, at fair value     17,488
Trading account assets, at fair value     (56,281)
Total investments     0
Reclassification (3) | ASU 2016-01      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Other Long-term Investments     (263,074)
Other invested assets     263,074
Total investments     $ 0
[1] Prior period amounts have been reclassified to conform to current period presentation. See "Adoption of ASU 2016-01" in Note 2 for details