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Related Party Transactions (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Jun. 15, 2018
May 17, 2018
Dec. 31, 2017
Related party transactions        
Seed investment $ 53,298     $ 17,997
GWL&A Financial | Surplus note due May 2048        
Related party transactions        
Surplus note     $ 346,218  
Fixed interest rate     4.881%  
GWL&A Financial | Surplus note issued May 19, 2006        
Related party transactions        
Surplus note   $ 333,400    
GWL&A Financial | Surplus note issued May 19, 2006 | 3 month LIBOR rate        
Related party transactions        
Variable interest rate   2.588%    
Great-West Funds, Inc.        
Related party transactions        
Seed investment $ 35,268