FAIR VALUE OF FINANCIAL INSTRUMENTS - Hierarchy for Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Assets:
Fixed maturity securities - available-for-sale	$ 49,898,408	$ 39,488,434
Fixed maturity securities - trading	2,457,010	2,725,694
Total fixed maturity securities	51,679,226	40,971,486
Equity securities	557,708	715,498
Other long-term investments	414,827	629,537
Short-term investments	666,301	527,144
Assets related to separate accounts
Variable annuity	12,288,919	13,956,071
Variable universal life	937,732	1,035,202
Fixed Maturities
Assets:
Fixed maturity securities - available-for-sale	49,263,033
Level 2 \| Corporate securities
Assets:
Total investments	42,100,000
Level 3 \| Other asset-backed securities
Assets:
Total investments	421,458	504,228
Level 3 \| Corporate securities
Assets:
Total investments	631,068	617,770
Measured at fair value on a recurring basis
Assets:
Total fixed maturity securities	51,679,225	40,971,486
Equity securities	557,708	715,498
Other long-term investments	414,827	629,537
Short-term investments	666,301	527,144
Total investments	53,318,061	42,843,665
Cash	151,400	178,855
Assets related to separate accounts
Variable annuity	12,288,919	13,956,071
Variable universal life	937,732	1,035,202
Total assets measured at fair value on a recurring basis	66,696,112	58,013,793
Liabilities:
Annuity account balances	76,119	83,472
Other liabilities	658,788	905,973
Total liabilities measured at fair value on a recurring basis	734,907	989,445
Measured at fair value on a recurring basis \| Residential mortgage-backed securities
Assets:
Fixed maturity securities - available-for-sale	3,602,991	2,318,493
Fixed maturity securities - trading	241,836	259,694
Measured at fair value on a recurring basis \| Commercial mortgage-backed securities
Assets:
Fixed maturity securities - available-for-sale	2,266,387	1,860,488
Fixed maturity securities - trading	188,925	146,804
Measured at fair value on a recurring basis \| Other asset-backed securities
Assets:
Fixed maturity securities - available-for-sale	1,391,893	1,249,549
Fixed maturity securities - trading	159,907	138,097
Measured at fair value on a recurring basis \| U.S. government-related securities
Assets:
Fixed maturity securities - available-for-sale	1,614,505	1,223,252
Fixed maturity securities - trading	59,794	27,234
Measured at fair value on a recurring basis \| States, municipals, and political subdivisions
Assets:
Fixed maturity securities - available-for-sale	3,588,841	1,741,645
Fixed maturity securities - trading	286,413	326,925
Measured at fair value on a recurring basis \| Other government-related securities
Assets:
Fixed maturity securities - available-for-sale	514,036	285,233
Fixed maturity securities - trading	44,207	63,925
Measured at fair value on a recurring basis \| Corporate securities
Assets:
Fixed maturity securities - available-for-sale	36,201,578	29,537,546
Fixed maturity securities - trading	1,423,833	1,698,183
Measured at fair value on a recurring basis \| Redeemable preferred stock
Assets:
Fixed maturity securities - available-for-sale	82,802	91,091
Fixed maturity securities - trading	11,277	3,327
Measured at fair value on a recurring basis \| Fixed Maturities
Assets:
Fixed maturity securities - available-for-sale	49,263,033	38,307,297
Fixed maturity securities - trading	2,416,192	2,664,189
Measured at fair value on a recurring basis \| Level 1
Assets:
Total fixed maturity securities	1,089,751	1,055,756
Equity securities	494,287	649,981
Other long-term investments	83,047	51,102
Short-term investments	589,084	394,394
Total investments	2,256,169	2,151,233
Cash	151,400	178,855
Assets related to separate accounts
Variable annuity	12,288,919	13,956,071
Variable universal life	937,732	1,035,202
Total assets measured at fair value on a recurring basis	15,634,220	17,321,361
Liabilities:
Annuity account balances	0	0
Other liabilities	56,018	5,755
Total liabilities measured at fair value on a recurring basis	56,018	5,755
Measured at fair value on a recurring basis \| Level 1 \| Residential mortgage-backed securities
Assets:
Fixed maturity securities - available-for-sale	0	0
Fixed maturity securities - trading	0	0
Measured at fair value on a recurring basis \| Level 1 \| Commercial mortgage-backed securities
Assets:
Fixed maturity securities - available-for-sale	0	0
Fixed maturity securities - trading	0	0
Measured at fair value on a recurring basis \| Level 1 \| Other asset-backed securities
Assets:
Fixed maturity securities - available-for-sale	0	0
Fixed maturity securities - trading	0	0
Measured at fair value on a recurring basis \| Level 1 \| U.S. government-related securities
Assets:
Fixed maturity securities - available-for-sale	985,485	958,775
Fixed maturity securities - trading	27,453	21,183
Measured at fair value on a recurring basis \| Level 1 \| States, municipals, and political subdivisions
Assets:
Fixed maturity securities - available-for-sale	0	0
Fixed maturity securities - trading	0	0
Measured at fair value on a recurring basis \| Level 1 \| Other government-related securities
Assets:
Fixed maturity securities - available-for-sale	0
Fixed maturity securities - trading	0	0
Measured at fair value on a recurring basis \| Level 1 \| Corporate securities
Assets:
Fixed maturity securities - available-for-sale	0	0
Fixed maturity securities - trading	0	0
Measured at fair value on a recurring basis \| Level 1 \| Redeemable preferred stock
Assets:
Fixed maturity securities - available-for-sale	65,536	72,471
Fixed maturity securities - trading	11,277	3,327
Measured at fair value on a recurring basis \| Level 1 \| Fixed Maturities
Assets:
Fixed maturity securities - available-for-sale	1,051,021	1,031,246
Fixed maturity securities - trading	38,730	24,510
Measured at fair value on a recurring basis \| Level 2
Assets:
Total fixed maturity securities	49,497,258	38,743,800
Equity securities	0	0
Other long-term investments	180,438	417,969
Short-term investments	77,217	132,750
Total investments	49,754,913	39,294,519
Cash	0	0
Assets related to separate accounts
Variable annuity	0	0
Variable universal life	0	0
Total assets measured at fair value on a recurring basis	49,754,913	39,294,519
Liabilities:
Annuity account balances	0	0
Other liabilities	164,643	302,656
Total liabilities measured at fair value on a recurring basis	164,643	302,656
Measured at fair value on a recurring basis \| Level 2 \| Residential mortgage-backed securities
Assets:
Fixed maturity securities - available-for-sale	3,602,991	2,318,493
Fixed maturity securities - trading	241,836	259,694
Measured at fair value on a recurring basis \| Level 2 \| Commercial mortgage-backed securities
Assets:
Fixed maturity securities - available-for-sale	2,266,387	1,860,488
Fixed maturity securities - trading	188,925	146,804
Measured at fair value on a recurring basis \| Level 2 \| Other asset-backed securities
Assets:
Fixed maturity securities - available-for-sale	970,251	745,184
Fixed maturity securities - trading	133,851	102,875
Measured at fair value on a recurring basis \| Level 2 \| U.S. government-related securities
Assets:
Fixed maturity securities - available-for-sale	629,020	264,477
Fixed maturity securities - trading	32,341	6,051
Measured at fair value on a recurring basis \| Level 2 \| States, municipals, and political subdivisions
Assets:
Fixed maturity securities - available-for-sale	3,588,841	1,741,645
Fixed maturity securities - trading	286,413	326,925
Measured at fair value on a recurring basis \| Level 2 \| Other government-related securities
Assets:
Fixed maturity securities - available-for-sale	514,036	285,233
Fixed maturity securities - trading	44,207	63,925
Measured at fair value on a recurring basis \| Level 2 \| Corporate securities
Assets:
Fixed maturity securities - available-for-sale	35,563,302	28,910,645
Fixed maturity securities - trading	1,417,591	1,692,741
Measured at fair value on a recurring basis \| Level 2 \| Redeemable preferred stock
Assets:
Fixed maturity securities - available-for-sale	17,266	18,620
Fixed maturity securities - trading	0	0
Measured at fair value on a recurring basis \| Level 2 \| Fixed Maturities
Assets:
Fixed maturity securities - available-for-sale	47,152,094	36,144,785
Fixed maturity securities - trading	2,345,164	2,599,015
Measured at fair value on a recurring basis \| Level 3
Assets:
Total fixed maturity securities	1,092,216	1,171,930
Equity securities	63,421	65,517
Other long-term investments	151,342	160,466
Short-term investments	0	0
Total investments	1,306,979	1,397,913
Cash	0	0
Assets related to separate accounts
Variable annuity	0	0
Variable universal life	0	0
Total assets measured at fair value on a recurring basis	1,306,979	1,397,913
Liabilities:
Annuity account balances	76,119	83,472
Other liabilities	438,127	597,562
Total liabilities measured at fair value on a recurring basis	514,246	681,034
Measured at fair value on a recurring basis \| Level 3 \| Residential mortgage-backed securities
Assets:
Fixed maturity securities - available-for-sale	0	0
Fixed maturity securities - trading	0	0
Measured at fair value on a recurring basis \| Level 3 \| Commercial mortgage-backed securities
Assets:
Fixed maturity securities - available-for-sale	0	0
Fixed maturity securities - trading	0	0
Measured at fair value on a recurring basis \| Level 3 \| Other asset-backed securities
Assets:
Fixed maturity securities - available-for-sale	421,642	504,365
Fixed maturity securities - trading	26,056	35,222
Measured at fair value on a recurring basis \| Level 3 \| U.S. government-related securities
Assets:
Fixed maturity securities - available-for-sale	0	0
Fixed maturity securities - trading	0	0
Measured at fair value on a recurring basis \| Level 3 \| States, municipals, and political subdivisions
Assets:
Fixed maturity securities - available-for-sale	0	0
Fixed maturity securities - trading	0	0
Measured at fair value on a recurring basis \| Level 3 \| Other government-related securities
Assets:
Fixed maturity securities - available-for-sale	0	0
Fixed maturity securities - trading	0	0
Measured at fair value on a recurring basis \| Level 3 \| Corporate securities
Assets:
Fixed maturity securities - available-for-sale	638,276	626,901
Fixed maturity securities - trading	6,242	5,442
Measured at fair value on a recurring basis \| Level 3 \| Redeemable preferred stock
Assets:
Fixed maturity securities - available-for-sale	0	0
Fixed maturity securities - trading	0	0
Measured at fair value on a recurring basis \| Level 3 \| Fixed Maturities
Assets:
Fixed maturity securities - available-for-sale	1,059,918	1,131,266
Fixed maturity securities - trading	$ 32,298	$ 40,664

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