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FAIR VALUE OF FINANCIAL INSTRUMENTS - Additional Information (Details) - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2017
Dec. 31, 2016
Mar. 31, 2017
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Assets and liabilities measured at fair value on a recurring basis            
Minimum percentage of the Company's fixed maturity securities priced by third party pricing services 91.00%          
Percentage of derivatives excluding embedded derivatives that were priced using exchange prices or independent broker quotations 100.00%          
Financial instruments with book value approximating fair value $ 77,700 $ 65,900        
Level 3            
Assets and liabilities measured at fair value on a recurring basis            
Level 3 fair value 788,312 659,459 $ 673,489 $ 1,060,904 $ 891,904 $ 678,068
Financial instruments that are valued using broker quotes 89,400 128,200        
Level 3 | Annuity account            
Assets and liabilities measured at fair value on a recurring basis            
Level 3 fair value 86,094 $ 87,616 $ 86,415 $ 88,820 $ 90,123 $ 92,512
Asset-backed securities | Level 2            
Assets and liabilities measured at fair value on a recurring basis            
Fair Value 4,900,000          
Asset-backed securities | Level 3            
Assets and liabilities measured at fair value on a recurring basis            
Fair Value $ 619,700          
Other asset-backed securities            
Assets and liabilities measured at fair value on a recurring basis            
Percentage of underlying collateral of student-loan backed auction rate securities guaranteed by the Federal Family Education Loan Program (FFELP), minimum 97.00% 97.00%        
Other asset-backed securities | Level 3            
Assets and liabilities measured at fair value on a recurring basis            
Fair Value $ 552,816 $ 553,308        
Percentage of underlying collateral of student-loan backed auction rate securities guaranteed by the Federal Family Education Loan Program (FFELP), minimum 97.00%          
Financial instruments that are valued using broker quotes $ 55,100 93,900        
Other asset-backed securities | Level 3 | Available-for-sale securities            
Assets and liabilities measured at fair value on a recurring basis            
Fair Value 564,800          
Other asset-backed securities | Level 3 | Trading securities            
Assets and liabilities measured at fair value on a recurring basis            
Fair Value 54,900          
Corporate Bonds And Securities | Level 2            
Assets and liabilities measured at fair value on a recurring basis            
Fair Value 32,000,000          
Corporate Bonds And Securities | Level 3            
Assets and liabilities measured at fair value on a recurring basis            
Fair Value 668,200          
Equity securities            
Assets and liabilities measured at fair value on a recurring basis            
Fair Value 66,300          
Federal Home Loan Bank (FHLB) Stock 65,600          
Equity securities | Level 3            
Assets and liabilities measured at fair value on a recurring basis            
Financial instruments that are valued using broker quotes $ 500 3,100        
Embedded derivative - GLWB | Minimum            
Assets and liabilities measured at fair value on a recurring basis            
Mortality (as a percent) 91.10%          
Embedded derivative - GLWB | Maximum            
Assets and liabilities measured at fair value on a recurring basis            
Mortality (as a percent) 106.60%          
Embedded derivative - FIA | Minimum            
Assets and liabilities measured at fair value on a recurring basis            
Mortality (as a percent) 46.00%          
Embedded derivative - FIA | Maximum            
Assets and liabilities measured at fair value on a recurring basis            
Mortality (as a percent) 113.00%          
Embedded derivative - IUL | Minimum            
Assets and liabilities measured at fair value on a recurring basis            
Mortality (as a percent) 38.00%          
Embedded derivative - IUL | Maximum            
Assets and liabilities measured at fair value on a recurring basis            
Mortality (as a percent) 153.00%          
Embedded derivative - Modified coinsurance agreements            
Assets and liabilities measured at fair value on a recurring basis            
Statutory policy liabilities (net of policy loans) $ 2,400,000          
Embedded derivative - Modified coinsurance agreements | Trading securities            
Assets and liabilities measured at fair value on a recurring basis            
Fair Value 207,600          
Corporate securities | Level 3            
Assets and liabilities measured at fair value on a recurring basis            
Fair Value 634,340 638,279        
Financial instruments that are valued using broker quotes $ 33,800 $ 31,300