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Schedule II - Primerica, Inc. (Parent Only) - Condensed Financial Information Parentheticals (Details) - USD ($)
$ / shares in Units, $ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Condensed Financial Statements, Captions [Line Items]        
Available-for-sale securities, debt maturities, amortized cost Basis $ 2,078,822 [1] $ 1,877,326 [2]    
Equity securities, at fair value, historical cost 34,997 0    
Trading securities, amortized cost $ 13,597 $ 6,172    
Common stock, par value $ 0.01 $ 0.01    
Common stock, shares authorized 500,000,000 500,000,000    
Common stock, shares issued 42,694,000 44,251,000    
Common stock, shares outstanding 42,694,000 44,251,000 45,721,000 48,297,000
Parent Company [Member]        
Condensed Financial Statements, Captions [Line Items]        
Available-for-sale securities, debt maturities, amortized cost Basis $ 108,623 $ 42,812    
Short term investments, amortized cost basis 8,171 0    
Equity securities, at fair value, historical cost 1,519 0    
Trading securities, amortized cost $ 0 $ 1,371    
Common stock, par value $ 0.01 $ 0.01    
Common stock, shares authorized 500,000,000 500,000,000    
Common stock, shares issued 42,694,000 44,251,000    
Common stock, shares outstanding 42,694,000 44,251,000    
[1] Includes $0.1 million of OTTI losses related to corporates and mortgage- and asset-backed securities recognized in accumulated other comprehensive income (loss).
[2] Includes $0.2 million of OTTI losses related to corporates and mortgage- and asset-backed securities recognized in accumulated other comprehensive income (loss).