INTANGIBLES (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2018	Dec. 31, 2017
Intangible assets:
Intangible assets	$ 1,506,269	$ 1,548,074
Goodwill	1,045,877	1,034,644
Other intangibles	35,847	35,890
Accumulated amortization	(904,011)	(864,576)
Net intangible assets	$ 1,683,982	$ 1,754,032
Finite-lived intangible assets, remaining amortization period	22 years 7 months 6 days	22 years 1 month 6 days
Intangible liabilities:
Below market lease intangibles	$ 357,191	$ 359,118
Other lease intangibles	32,324	40,141
Accumulated amortization	(188,537)	(160,985)
Purchase option intangibles	3,568	3,568
Net intangible liabilities	$ 204,546	$ 241,842
Below market leases, remaining weighted average amortization period (in years)	14 years 6 months	13 years 8 months 12 days
Other lease intangibles, remaining weighted average amortization period (in years)	43 years 3 months 18 days	40 years 9 months 18 days
Net intangible liabilities, remaining weighted average amortization period (in years)	16 years 7 months 6 days	15 years 7 months 6 days
Above Market Lease Intangibles
Intangible assets:
Intangible assets	$ 183,212	$ 185,012
Finite-lived intangible assets, remaining amortization period	6 years 9 months 18 days	7 years
In-place and Other Lease Intangibles
Intangible assets:
Intangible assets	$ 1,323,057	$ 1,363,062
Finite-lived intangible assets, remaining amortization period	24 years 7 months 6 days	24 years
Other Intangibles
Intangible assets:
Finite-lived intangible assets, remaining amortization period	12 years 1 month 6 days	14 years 1 month 6 days