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CERTAIN NONTRADITIONAL LONG-DURATION CONTRACTS - Activity During Period (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2018
Dec. 31, 2017
CERTAIN NONTRADITIONAL LONG-DURATION CONTRACTS          
Separate account balances       $ 12,288,919 $ 13,956,071
VA | CALIC          
CERTAIN NONTRADITIONAL LONG-DURATION CONTRACTS          
Average attained age of contract holders 68 years        
Percentage of variable annuity business reinsured 100.00%        
VA | Acquisitions | CALIC          
CERTAIN NONTRADITIONAL LONG-DURATION CONTRACTS          
Guaranteed amount payable       12,300  
Guaranteed minimum death benefits (GMDB)          
CERTAIN NONTRADITIONAL LONG-DURATION CONTRACTS          
Separate account balances       $ 8,400,000 9,700,000
Guaranteed minimum death benefits (GMDB) | VA          
CERTAIN NONTRADITIONAL LONG-DURATION CONTRACTS          
Interest rate at which last anniversary date account value is compounded (as a percent)       5.00%  
Separate account balances       $ 11,800,000 13,700,000
Mean investment performance (as a percent)       6.51%  
Average discount rate (as a percent)       4.80%  
Guaranteed amount payable       $ 340,600  
Guaranteed amount payable with GMDB reserve $ 34,083 $ 34,796 $ 36,427 44,321 $ 34,083
Average attained age of contract holders 71 years        
Activity relating to GMDB reserves (excluding those 100% reinsured under the Modco agreement)          
Balance at the beginning of the period $ 34,083 34,796 36,427    
Incurred guarantee benefits 13,619 902 678    
Less: Paid guarantee benefits 3,381 1,615 2,309    
Balance at the end of the period 44,321 $ 34,083 $ 34,796    
Guaranteed minimum death benefits (GMDB) | VA | Annuities          
CERTAIN NONTRADITIONAL LONG-DURATION CONTRACTS          
Guaranteed amount payable       274,400  
Guaranteed amount payable with GMDB reserve 39,200     39,200  
Activity relating to GMDB reserves (excluding those 100% reinsured under the Modco agreement)          
Balance at the end of the period 39,200        
Guaranteed minimum death benefits (GMDB) | VA | Acquisitions          
CERTAIN NONTRADITIONAL LONG-DURATION CONTRACTS          
Guaranteed amount payable       66,200  
Guaranteed amount payable with GMDB reserve 5,100     $ 5,100  
Activity relating to GMDB reserves (excluding those 100% reinsured under the Modco agreement)          
Balance at the end of the period $ 5,100