REDEEMABLE INTERESTS AND NONCONTROLLING INTERESTS - Variable Interest Entities (Details) - USD ($)	Dec. 31, 2018	Dec. 31, 2017
Variable Interest Entity [Line Items]
Assets, Consolidated	$ 622,613,000	$ 651,272,000
Liabilities, Consolidated	561,700,000	590,864,000
Assets, Unconsolidated	27,619,000
Maximum Risk of Loss, Unconsolidated	59,492,000
Atlanta Outlet Outparcels, LLC
Variable Interest Entity [Line Items]
Assets, Consolidated	868,000	878,000
Liabilities, Consolidated	0	0
Atlanta Outlet JV, LLC
Variable Interest Entity [Line Items]
Assets, Consolidated	56,537,000	60,476,000
Liabilities, Consolidated	78,356,000	79,769,000
Guaranteed amount	4,575,000
CBL Terrace LP
Variable Interest Entity [Line Items]
Assets, Consolidated	15,531,000	16,472,000
Liabilities, Consolidated	12,987,000	13,313,000
El Paso Outlet Center Holding, LLC
Variable Interest Entity [Line Items]
Assets, Consolidated	98,307,000	93,139,000
Liabilities, Consolidated	78,210,000	65,149,000
El Paso Outlet Center II, LLC
Variable Interest Entity [Line Items]
Assets, Consolidated	12,000	8,512,000
Liabilities, Consolidated	0	6,955,000
Gettysburg Outlet Center Holding, LLC
Variable Interest Entity [Line Items]
Assets, Consolidated	34,857,000	36,386,000
Liabilities, Consolidated	38,835,000	39,049,000
Gettysburg Outlet Center, LLC
Variable Interest Entity [Line Items]
Assets, Consolidated	7,871,000	7,218,000
Liabilities, Consolidated	140,000	74,000
High Point Development LP II
Variable Interest Entity [Line Items]
Assets, Consolidated	1,062,000	1,084,000
Liabilities, Consolidated	76,000	69,000
Jarnigan Road LP
Variable Interest Entity [Line Items]
Assets, Consolidated	17,992,000	41,671,000
Liabilities, Consolidated	1,071,000	20,229,000
Jarnigan Road II, LLC
Variable Interest Entity [Line Items]
Assets, Consolidated	23,789,000	0
Liabilities, Consolidated	18,444,000	0
Laredo Outlet JV, LLC
Variable Interest Entity [Line Items]
Assets, Consolidated	106,817,000	110,174,000
Liabilities, Consolidated	57,614,000	81,618,000
Guaranteed amount	54,550,000
Lebcon Associates
Variable Interest Entity [Line Items]
Assets, Consolidated	68,868,000	59,375,000
Liabilities, Consolidated	121,670,000	120,879,000
Lebcon I, Ltd
Variable Interest Entity [Line Items]
Assets, Consolidated	8,621,000	9,034,000
Liabilities, Consolidated	9,239,000	9,463,000
Lee Partners
Variable Interest Entity [Line Items]
Assets, Consolidated	784,000	1,011,000
Liabilities, Consolidated	0	0
Louisville Outlet Outparcels, LLC
Variable Interest Entity [Line Items]
Assets, Consolidated	174,000	74,000
Liabilities, Consolidated	0	0
Louisville Outlet Shoppes, LLC
Variable Interest Entity [Line Items]
Assets, Consolidated	69,182,000	73,173,000
Liabilities, Consolidated	81,713,000	83,543,000
Guaranteed amount	9,482,000
Madison Grandview Forum, LLC
Variable Interest Entity [Line Items]
Assets, Consolidated	31,739,000	32,692,000
Liabilities, Consolidated	13,346,000	13,198,000
The Promenade at D'Iberville
Variable Interest Entity [Line Items]
Assets, Consolidated	78,979,000	81,500,000
Liabilities, Consolidated	49,383,000	46,568,000
Statesboro Crossing, LLC
Variable Interest Entity [Line Items]
Assets, Consolidated	623,000	18,403,000
Liabilities, Consolidated	616,000	$ 10,988,000
Ambassador Infrastructure, LLC
Variable Interest Entity [Line Items]
Assets, Unconsolidated	0
Maximum Risk of Loss, Unconsolidated	10,605,000
Continental 425 Fund LLC
Variable Interest Entity [Line Items]
Assets, Unconsolidated	7,250,000
Maximum Risk of Loss, Unconsolidated	0
EastGate Storage, LLC
Variable Interest Entity [Line Items]
Assets, Unconsolidated	1,142,000
Maximum Risk of Loss, Unconsolidated	6,500,000
Self Storage at Mid Rivers, LLC
Variable Interest Entity [Line Items]
Assets, Unconsolidated	1,084,000
Maximum Risk of Loss, Unconsolidated	5,987,000
Shoppes at Eagle Point, LLC
Variable Interest Entity [Line Items]
Assets, Unconsolidated	18,143,000
Maximum Risk of Loss, Unconsolidated	36,400,000
G&I VIII CBL Triangle LLC
Variable Interest Entity [Line Items]
Assets, Unconsolidated	0
Maximum Risk of Loss, Unconsolidated	$ 0