INTANGIBLES (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
	Mar. 31, 2012 Y	Dec. 31, 2011 Y
Intangible assets:
Above market lease intangibles	$ 210,109	$ 210,358
In-place and other lease intangibles	589,027	590,500
Other intangibles	15,904	16,169
Accumulated amortization	(224,290)	(188,442)
Goodwill	448,053	448,393
Net intangible assets	1,038,803	1,076,978
Remaining weighted average amortization period of above market lease intangible assets (in years)	10.1	10.1
Remaining weighted average amortization period of in-place lease intangible assets (in years)	23.6	22.4
Remaining weighted average amortization period of other intangible assets (in years)	13.7	13.5
Remaining weighted average amortization period of lease-related intangible assets (in years)	19.2	18.5
Intangible liabilities:
Below market lease intangibles	436,416	442,612
Other lease intangibles	26,777	27,157
Accumulated amortization	(49,273)	(37,607)
Purchase option intangibles	66,362	112,670
Net intangible liabilities	$ 480,282	$ 544,832
Remaining weighted average amortization period of below market lease intangible liabilities (in years)	15.3	15.3
Remaining weighted average amortization period of other lease intangible liabilities (in years)	7.7	7.9
Remaining weighted average amortization period of lease-related intangible liabilities (in years)	15.1	15.2