COMMITMENTS AND CONTINGENCIES - Additional Information (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($) city	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Operating leased assets
Rent expense	$ 6,300
Rental expense		$ 11,300	$ 11,700
Aggregate annualized rent	6,300
Outstanding mortgage loan commitments	$ 757,400	$ 685,300
Average rate (as a percent)	3.99%	4.42%
Reinsurance receivable	$ 3,893,235	$ 4,213,399
Administrative and marketing office space
Operating leased assets
Number of cities in which the company leases properties | city	16
Administrative and marketing office space | Minimum
Operating leased assets
Lease term	2 years
Administrative and marketing office space | Maximum
Operating leased assets
Lease term	25 years
Building contiguous to home office
Operating leased assets
Approximate price for which the company may purchase building at the end of lease term		$ 75,000
Scottish Re, Inc.
Operating leased assets
Outstanding claims receivable	$ 15,200
Reinsurance receivable	118,400
Statutory reserve credit	$ 134,700