LOANS HELD-FOR-INVESTMENT (Schedule Of Primary Credit Quality Indicator) (Details)	Sep. 30, 2020 USD ($)	Jun. 30, 2020 USD ($)	Mar. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Financing Receivable, Credit Quality Indicator [Line Items]
Loans held-for-investment and related receivables, net	$ 892,895,000			$ 301,630,000
Less: Allowance for credit losses	(35,039,000)	$ (27,684,000)	$ (19,779,000)	0
Total loans held-for-investment and related receivables, net	$ 857,856,000			301,630,000
Weighted Average Risk Rating	3.3
Mezzanine Loans
Financing Receivable, Credit Quality Indicator [Line Items]
2020	$ 0
2019	57,045,000
2018	89,471,000
Loans held-for-investment and related receivables, net	146,516,000			146,060,000
Less: Allowance for credit losses	(24,870,000)	(21,269,000)	(14,541,000)	0
Total loans held-for-investment and related receivables, net	121,600,000
Mezzanine Loans | 1
Financing Receivable, Credit Quality Indicator [Line Items]
2020	0
2019	0
2018	0
Loans held-for-investment and related receivables, net	0
Mezzanine Loans | 2
Financing Receivable, Credit Quality Indicator [Line Items]
2020	0
2019	0
2018	0
Loans held-for-investment and related receivables, net	0
Mezzanine Loans | 3
Financing Receivable, Credit Quality Indicator [Line Items]
2020	0
2019	0
2018	0
Loans held-for-investment and related receivables, net	0
Mezzanine Loans | 4
Financing Receivable, Credit Quality Indicator [Line Items]
2020	0
2019	0
2018	0
Loans held-for-investment and related receivables, net	0
Mezzanine Loans | 5
Financing Receivable, Credit Quality Indicator [Line Items]
2020	0
2019	57,045,000
2018	89,471,000
Loans held-for-investment and related receivables, net	146,516,000
Senior Loans
Financing Receivable, Credit Quality Indicator [Line Items]
2020	212,385,000
2019	114,859,000
2018	0
Loans held-for-investment and related receivables, net	327,244,000			152,820,000
Less: Allowance for credit losses	(1,882,000)	(492,000)	(809,000)	0
Senior Loans | 1
Financing Receivable, Credit Quality Indicator [Line Items]
2020	0
2019	0
2018	0
Loans held-for-investment and related receivables, net	0
Senior Loans | 2
Financing Receivable, Credit Quality Indicator [Line Items]
2020	0
2019	0
2018	0
Loans held-for-investment and related receivables, net	0
Senior Loans | 3
Financing Receivable, Credit Quality Indicator [Line Items]
2020	212,385,000
2019	114,859,000
2018	0
Loans held-for-investment and related receivables, net	327,244,000
Senior Loans | 4
Financing Receivable, Credit Quality Indicator [Line Items]
2020	0
2019	0
2018	0
Loans held-for-investment and related receivables, net	0
Senior Loans | 5
Financing Receivable, Credit Quality Indicator [Line Items]
2020	0
2019	0
2018	0
Loans held-for-investment and related receivables, net	0
Broadly Syndicated Loans
Financing Receivable, Credit Quality Indicator [Line Items]
2020	416,396,000
2019	2,739,000
2018	0
Loans held-for-investment and related receivables, net	419,135,000			2,750,000
Less: Allowance for credit losses	(8,287,000)	$ (5,923,000)	$ (4,429,000)	0
Total loans held-for-investment and related receivables, net	410,848,000			$ 2,750,000
Broadly Syndicated Loans | 1
Financing Receivable, Credit Quality Indicator [Line Items]
2020	0
2019	0
2018	0
Loans held-for-investment and related receivables, net	0
Broadly Syndicated Loans | 2
Financing Receivable, Credit Quality Indicator [Line Items]
2020	5,957,000
2019	0
2018	0
Loans held-for-investment and related receivables, net	5,957,000
Broadly Syndicated Loans | 3
Financing Receivable, Credit Quality Indicator [Line Items]
2020	403,158,000
2019	2,739,000
2018	0
Loans held-for-investment and related receivables, net	405,897,000
Broadly Syndicated Loans | 4
Financing Receivable, Credit Quality Indicator [Line Items]
2020	7,281,000
2019	0
2018	0
Loans held-for-investment and related receivables, net	7,281,000
Broadly Syndicated Loans | 5
Financing Receivable, Credit Quality Indicator [Line Items]
2020	0
2019	0
2018	0
Loans held-for-investment and related receivables, net	$ 0