INVESTMENTS - Transitional Real Estate Loans by Key Credit Quality Indicators (Details) - Transitional real estate loans	Mar. 31, 2020 USD ($)
Financing Receivable, Credit Quality Indicator [Line Items]
2020	$ 329
2019	2,142
2018	2,240
2017	841
2016	34
Prior	57
Total Financing Receivable	5,643
Loan to Value Ratio, Zero to Fifty-nine Point Nine-nine Percent
Financing Receivable, Credit Quality Indicator [Line Items]
2020	33
2019	471
2018	409
2017	155
2016	20
Prior	57
Total Financing Receivable	1,145
Loan to Value Ratio, Sixty to Sixty-nine Point Nine-nine Percent
Financing Receivable, Credit Quality Indicator [Line Items]
2020	190
2019	777
2018	834
2017	436
2016	0
Prior	0
Total Financing Receivable	2,237
Loan to Value Ratio, Seventy to Seventy-nine Point Nine-nine Percent
Financing Receivable, Credit Quality Indicator [Line Items]
2020	81
2019	858
2018	997
2017	250
2016	14
Prior	0
Total Financing Receivable	2,200
Loan-to-Value Ratio Eighty Percent and Above
Financing Receivable, Credit Quality Indicator [Line Items]
2020	25
2019	36
2018	0
2017	0
2016	0
Prior	0
Total Financing Receivable	$ 61