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FAIR VALUE OF FINANCIAL INSTRUMENTS - Additional Information (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Mar. 31, 2020	Dec. 31, 2019	Mar. 31, 2019	Dec. 31, 2018
Determination of fair values
Number of sources of information considered			1
Number of sources of information			3
Minimum percentage of the Company's fixed maturity securities priced by third party pricing services			92.50%
Number of broker quotes obtained per security			2
Percentage of derivatives excluding embedded derivatives that were priced using exchange prices or independent broker quotations			87.10%
Other long-term investments	$ 1,172,964,000		$ 1,172,964,000			$ 995,493,000
Financial instruments owned, other	73,400,000		73,400,000			73,000,000.0
Securities transferred into Level 3	54,800,000	$ 50,100,000	84,300,000	$ 86,100,000
Securities transferred into Level 2 from Level 3	1,200,000	1,600,000	1,200,000	20,600,000
Interest support, YRT premium support and portfolio maintenance agreement
Determination of fair values
Other long-term investments	113,700,000		113,700,000
Golden Gate II \| Interest Support Agreement
Determination of fair values
Other long-term investments	60,800,000		60,800,000
Payments made under agreement			2,400,000
Amount of collateralized support agreement obligations by PLC	5,500,000		5,500,000
Golden Gate II \| YRT premium support agreement
Determination of fair values
Other long-term investments	52,400,000		52,400,000
Payments made under agreement			1,600,000
Golden Gate, Golden Gate V and West Coast Life \| Portfolio maintenance agreements
Determination of fair values
Other long-term investments	400,000		400,000
Payments made under agreement			0
Level 3
Determination of fair values
Level 3 fair value	1,732,315,000	$ 914,620,000	1,732,315,000	$ 914,620,000	$ 1,330,669,000	1,087,700,000	$ 681,268,000	$ 514,246,000
Financial instruments valued in broker quotes	95,600,000		95,600,000			76,800,000
Asset-backed securities \| Level 2
Determination of fair values
Fair value	11,300,000,000		11,300,000,000
Asset-backed securities \| Level 3
Determination of fair values
Fair value	501,600,000		$ 501,600,000
Other asset-backed securities
Determination of fair values
Underlying collateral percentage			9700.00%
Other asset-backed securities \| Level 3
Determination of fair values
Fair value	430,964,000		$ 430,964,000			421,219,000
Underlying collateral percentage			97.00%
Financial instruments valued in broker quotes	79,100,000		$ 79,100,000			65,400,000
Other asset-backed securities \| Level 3 \| Available-for-sale securities
Determination of fair values
Fair value	441,000,000.0		441,000,000.0
Other asset-backed securities \| Level 3 \| Trading securities
Determination of fair values
Fair value	60,600,000		60,600,000
Corporate bonds and securities \| Level 2
Determination of fair values
Fair value	54,800,000,000		54,800,000,000
Corporate bonds and securities \| Level 3
Determination of fair values
Fair value	1,400,000,000		1,400,000,000
Equity securities
Determination of fair values
Fair value	78,600,000		78,600,000
Federal Home Loan Bank stock	73,400,000		73,400,000
Equity securities \| Level 3
Determination of fair values
Financial instruments valued in broker quotes	5,200,000		5,200,000
Embedded derivative - GLWB \| Level 3
Determination of fair values
Fair value	590,762,000		$ 590,762,000
Embedded derivative - GLWB \| Level 3 \| Minimum
Determination of fair values
Mortality rate			87.00%
Embedded derivative - GLWB \| Level 3 \| Maximum
Determination of fair values
Mortality rate			100.00%
Embedded derivative - FIA \| Level 3 \| Minimum
Determination of fair values
Mortality rate			87.00%
Embedded derivative - FIA \| Level 3 \| Maximum
Determination of fair values
Mortality rate			100.00%
Embedded derivative - IUL \| Level 3 \| Minimum
Determination of fair values
Mortality rate			37.00%
Embedded derivative - IUL \| Level 3 \| Maximum
Determination of fair values
Mortality rate			156.00%
Funds withheld derivative \| Level 2
Determination of fair values
Other liabilities	159,400,000		$ 159,400,000
Corporate securities \| Level 3
Determination of fair values
Fair value	1,365,963,000		1,365,963,000			1,373,714,000
Financial instruments valued in broker quotes	$ 11,300,000		$ 11,300,000			$ 11,400,000