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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
Annuity account | CALIC          
CERTAIN NONTRADITIONAL LONG-DURATION CONTRACTS          
Average attained age of contract holders 68 years        
Percentage of variable annuity business reinsured 100.00%        
Annuity account | Acquisitions | CALIC          
CERTAIN NONTRADITIONAL LONG-DURATION CONTRACTS          
Guaranteed amount payable       $ 12,300  
Guaranteed minimum death benefits (GMDB) | Annuity account          
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 $ 26,934 $ 27,835 $ 29,931 34,700 26,934
Average attained age of contract holders 71 years        
Activity relating to GMDB reserves (excluding those 100% reinsured under the Modco agreement)          
Beginning balance $ 26,934 27,835 29,931    
Incurred guarantee benefits 11,065 (181) (682)    
Less: Paid guarantee benefits 3,299 720 1,414    
Ending balance 34,700 $ 26,934 $ 27,835    
Guaranteed minimum death benefits (GMDB) | Annuity account | 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)          
Ending balance 39,200        
Guaranteed minimum death benefits (GMDB) | Annuity account | 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)          
Ending balance $ 5,100        
Guaranteed living withdrawal benefits (GLWB) | Annuity account          
CERTAIN NONTRADITIONAL LONG-DURATION CONTRACTS          
Separate account balances       $ 8,400,000 $ 9,700,000