CREDIT FACILITIES, NOTES PAYABLE AND REPURCHASE FACILITIES (Schedule of Debt) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Short-Term and Long-Term Debt [Roll Forward]
Total debt, Beginning Balance			$ 1,611,261
Net premiums, Beginning Balance			241
Total debt, net, Beginning Balance			1,604,860
Total debt, Debt Issuances & Assumptions			461,194
Total debt, net, Debt Issuances & Assumptions			461,194
Total debt, Repayments & Modifications			(219,143)
Total debt, net, Repayments & Modifications			(218,957)
Net premiums, Accretion and (Amortization)			(70)	$ (67)
Accretion and (Amortization)			2,002
Total debt, Ending Balance	$ 1,853,312		1,853,312
Net premiums, Ending Balance	171		171
Total debt, net, Ending Balance	1,849,099		1,849,099
Loss on extinguishment of debt	89	$ 2,302	4,841	$ 2,302
Fixed rate debt
Short-Term and Long-Term Debt [Roll Forward]
Total debt, Beginning Balance			726,261
Deferred costs, Beginning Balance			(2,709)
Total debt, Debt Issuances & Assumptions			0
Total debt, Repayments & Modifications			(219,143)
Deferred costs, Repayments & Modifications			186
Deferred costs, Accretion and (Amortization)			736
Total debt, Ending Balance	507,118		507,118
Deferred costs, Ending Balance	(1,787)		(1,787)
Credit facilities
Short-Term and Long-Term Debt [Roll Forward]
Total debt, Beginning Balance			885,000
Deferred costs, Beginning Balance			(3,933)
Total debt, Debt Issuances & Assumptions			286,500
Total debt, Repayments & Modifications			0
Deferred costs, Repayments & Modifications			0
Deferred costs, Accretion and (Amortization)			1,336
Total debt, Ending Balance	1,171,500		1,171,500
Deferred costs, Ending Balance	(2,597)		(2,597)
Repurchase facilities
Short-Term and Long-Term Debt [Roll Forward]
Total debt, Beginning Balance			0
Total debt, Debt Issuances & Assumptions			174,694
Total debt, Repayments & Modifications			0
Total debt, Ending Balance	$ 174,694		$ 174,694