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INVESTMENT OPERATIONS - Additional Information (Details)
$ in Thousands
6 Months Ended
Jun. 30, 2020
USD ($)
position
Dec. 31, 2019
USD ($)
Schedule of Investments [Line Items]    
Unrealized loss, greater than 12 months $ 237,385 $ 239,860
Total positions that were in an unrealized loss position | position 798  
Fixed maturity securities - available-for-sale $ 67,160,250 64,746,076
Available-for-sale, amortized cost 62,741,533 61,970,744
Fixed maturity securities - trading 2,748,839 2,625,436
Below investment grade    
Schedule of Investments [Line Items]    
Fixed maturity securities - available-for-sale 2,000,000  
Available-for-sale, amortized cost 2,300,000  
Fixed maturity securities - trading 127,200  
Securities not publicly traded 296,400  
Residential mortgage-backed securities    
Schedule of Investments [Line Items]    
Unrealized loss, greater than 12 months 5 2,091
Fixed maturity securities - available-for-sale 7,014,129 5,931,341
Available-for-sale, amortized cost 6,783,626 5,812,170
Fixed maturity securities - trading 192,944 209,521
Commercial mortgage-backed securities    
Schedule of Investments [Line Items]    
Unrealized loss, greater than 12 months 1,274 1,571
Fixed maturity securities - available-for-sale 2,541,482 2,639,668
Available-for-sale, amortized cost 2,482,700 2,588,575
Fixed maturity securities - trading 189,995 201,284
Other asset-backed securities    
Schedule of Investments [Line Items]    
Unrealized loss, greater than 12 months 15,499 8,410
Unrealized losses, greater than twelve months, credit related $ 700  
Underlying collateral percentage 9700.00%  
Fixed maturity securities - available-for-sale $ 1,702,024 1,781,235
Available-for-sale, amortized cost 1,704,674 1,764,120
Fixed maturity securities - trading 144,248 143,361
U.S. government-related securities    
Schedule of Investments [Line Items]    
Unrealized loss, greater than 12 months 29 1,943
Fixed maturity securities - available-for-sale 1,173,918 1,032,396
Available-for-sale, amortized cost 1,145,220 1,032,048
Fixed maturity securities - trading 42,677 47,067
Other government-related securities    
Schedule of Investments [Line Items]    
Unrealized loss, greater than 12 months 1,185 1,322
Fixed maturity securities - available-for-sale 626,170 597,169
Available-for-sale, amortized cost 566,961 548,136
Fixed maturity securities - trading 29,210 28,775
States, municipals, and political subdivisions    
Schedule of Investments [Line Items]    
Unrealized loss, greater than 12 months 77 229
Fixed maturity securities - available-for-sale 4,562,366 4,638,850
Available-for-sale, amortized cost 4,143,375 4,415,008
Fixed maturity securities - trading 289,477 293,791
Corporate securities    
Schedule of Investments [Line Items]    
Unrealized loss, greater than 12 months 219,316 220,045
Unrealized losses, greater than twelve months, credit related 81,400  
Fixed maturity securities - available-for-sale 48,436,519 46,809,101
Available-for-sale, amortized cost 44,810,937 44,493,799
Fixed maturity securities - trading 1,757,339 1,590,936
Fixed maturities    
Schedule of Investments [Line Items]    
Fixed maturity securities - available-for-sale 66,122,281 63,516,425
Available-for-sale, amortized cost 61,703,564 60,741,093
Fixed maturity securities - trading 2,657,823 2,527,567
Gross unrecognized holding gains 218,821 201,909
Gross unrecognized holding losses $ 0 $ 0