Note 5 - Other Real Estate Investments (Details) (USD $) Share data in Millions, unless otherwise specified	3 Months Ended			9 Months Ended
	Sep. 30, 2013		Sep. 30, 2012	Sep. 30, 2013		Sep. 30, 2012	Dec. 31, 2012
Note 5 - Other Real Estate Investments (Details) [Line Items]
Equity Method Investments	$ 1,308,184,000			$ 1,308,184,000			$ 1,428,155,000
Number of Real Estate Properties	22			22
Income (Loss) from Equity Method Investments	96,200,000		24,500,000	179,791,000		89,587,000
Cost Method Investments	4,992,000			4,992,000
Marketable Securities	88,656,000	[1]		88,656,000	[1]		36,541,000	[1]
Albertsons [Member] | Supervalu Transaction [Member]
Note 5 - Other Real Estate Investments (Details) [Line Items]
Number of Real Estate Properties	414			414
Payments to Acquire Equity Method Investments				22,300,000
Sale of Stock, Percentage of Ownership after Transaction				13.60%
Supervalu [Member]
Note 5 - Other Real Estate Investments (Details) [Line Items]
Equity Method Investments	11,000,000			11,000,000
Income (Loss) from Equity Method Investments				11,300,000
NAI Group Holdings [Member] | Supervalu Transaction [Member]
Note 5 - Other Real Estate Investments (Details) [Line Items]
Number of Real Estate Properties	456			456
Cost Method Investments	14,900,000			14,900,000
Cost Method Investment, Ownership Percentage	15.00%			15.00%
Number of Grocery Banners	4			4
Supervalu [Member]
Note 5 - Other Real Estate Investments (Details) [Line Items]
Investment Owned, Balance, Shares (in Shares)	8.2			8.2
Supervalu Transaction [Member]
Note 5 - Other Real Estate Investments (Details) [Line Items]
Marketable Securities	33,600,000			33,600,000
Net Leased Properties [Member] | Preferred Equity Capital [Member]
Note 5 - Other Real Estate Investments (Details) [Line Items]
Number of Real Estate Properties	391			391
Supervalu Transaction [Member]
Note 5 - Other Real Estate Investments (Details) [Line Items]
Investment Owned, at Cost	70,800,000			70,800,000
Preferred Equity Capital [Member]
Note 5 - Other Real Estate Investments (Details) [Line Items]
Equity Method Investments	246,500,000			246,500,000
Number of Real Estate Properties	483			483
Income (Loss) from Equity Method Investments				37,900,000		26,000,000
Equity Method Investment, Realized Gain (Loss) on Disposal				20,300,000		6,600,000
Number of Capital Transactions	9		17	9		17
Number of Agreements			1			1
Business Combination, Step Acquisition, Equity Interest in Acquiree, Remeasurement Loss				$ 9,600,000

[1] As of September 30, 2013 and December 31, 2012, the Company determined that $85.6 million and $33.4 million, respectively, of the Marketable securities estimated fair value were classified within Level 1 of the fair value hierarchy and the remaining $3.3 million and $3.4 million, respectively, were classified within Level 3 of the fair value hierarchy.