INTANGIBLES (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2017	Dec. 31, 2016
Intangible assets:
Goodwill	$ 1,033,484	$ 1,033,225
Accumulated amortization	(793,927)	(769,558)
Net intangible assets	$ 1,807,720	$ 1,810,079
Remaining Weighted Average Amortization Period in Years	21 years 2 months 12 days	21 years 6 months
Intangible liabilities:
Below market lease intangibles	$ 361,388	$ 345,103
Other lease intangibles	40,343	40,843
Accumulated amortization	(140,822)	(133,468)
Purchase option intangibles	3,568	3,568
Net intangible liabilities	$ 264,477	$ 256,046
Below market leases, remaining weighted average amortization period (in years)	13 years 9 months 18 days	14 years 1 month 6 days
Other lease intangibles, remaining weighted average amortization period (in years)	39 years	38 years 6 months
Net intangible liabilities, remaining weighted average amortization period (in years)	15 years 7 months 6 days	15 years 10 months 24 days
Above market lease intangibles
Intangible assets:
Intangible assets	$ 188,684	$ 184,993
Remaining Weighted Average Amortization Period in Years	7 years 3 months 18 days	6 years 10 months 24 days
In-place and other lease intangibles
Intangible assets:
Intangible assets	$ 1,343,682	$ 1,325,636
Remaining Weighted Average Amortization Period in Years	23 years 3 months 18 days	23 years 7 months 6 days
Other intangibles
Intangible assets:
Other intangibles	$ 35,797	$ 35,783
Remaining Weighted Average Amortization Period in Years	11 years 10 months 24 days	11 years 3 months 18 days