Equity Investments in Real Estate (Details) (USD $)	3 Months Ended			6 Months Ended
	Jun. 30, 2012		Jun. 30, 2011	Jun. 30, 2012		Jun. 30, 2011	Dec. 31, 2011
Schedule of Equity Method Investments [Line Items]
Equity investments in real estate	$ 187,196,000			$ 187,196,000			$ 187,067,000
Capital contributions to equity investments				7,890,000		229,639,000
Income from equity investments in real estate in excess of distributions received				578,000		336,000
Equity Method Investment Summarized Financial Information [Abstract]
Assets	1,088,357,000			1,088,357,000			1,125,342,000
Liabilities	(699,811,000)			(699,811,000)			(748,312,000)
Partners/members equity	388,546,000			388,546,000			377,030,000
Equity Method Investment Summarized Financial Information Income Statement [Abstract]
Revenues	32,236,000		20,926,000	58,854,000		28,424,000
Expenses	(18,066,000)		(17,117,000)	(40,184,000)		(21,887,000)
Net Income from continuing operations	14,170,000		3,809,000	18,670,000		6,537,000
Net income attributable to equity method investments	14,170,000		3,809,000	18,670,000		6,537,000
C 1000 BV [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investment Ownership Percentage	85.00%	[1],[2]		85.00%	[1],[2]
Equity investments in real estate	83,364,000	[1],[2]		83,364,000	[1],[2]		89,063,000	[1],[2]
Uhaul Moving Partners Inc And Mercury Partners Lp [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investment Ownership Percentage	12.00%	[3]		12.00%	[3]
Equity investments in real estate	28,506,000	[3]		28,506,000	[3]		28,956,000	[3]
Berry Plastics Corporation [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investment Ownership Percentage	50.00%			50.00%
Equity investments in real estate	18,975,000			18,975,000			19,411,000
Tesco Plc [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investment Ownership Percentage	49.00%	[1]		49.00%	[1]
Equity investments in real estate	17,309,000	[1]		17,309,000	[1]		17,923,000	[1]
Hellweg Die Profi Baumarkt Gmbh And Co KG [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investment Ownership Percentage	33.00%	[1],[3],[4]		33.00%	[1],[3],[4]
Equity investments in real estate	24,594,000	[1],[3],[4]		24,594,000	[1],[3],[4]		16,817,000	[1],[3],[4]
Capital contributions to equity investments				7,900,000
Gains (Losses) on Extinguishment of Debt				5,900,000
Income from equity investments in real estate in excess of distributions received				1,900,000
Eroski Sociedad Cooperativa Mallorca [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investment Ownership Percentage	30.00%	[1],[3]		30.00%	[1],[3]
Equity investments in real estate	9,022,000	[1],[3]		9,022,000	[1],[3]		9,158,000	[1],[3]
Dicks Sporting Goods Inc [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investment Ownership Percentage	45.00%			45.00%
Equity investments in real estate	$ 5,426,000			$ 5,426,000			$ 5,739,000

[1] The carrying value of this investment is affected by the impact of fluctuations in the exchange rate of the Euro.

[2] We acquired our tenancy-in-common interest, under which the entity is under common control by us and our investment partner, in this investment in January 2011.

[3] We acquired our interest in this investment from CPA®:14 in May 2011 in connection with the CPA®:14/16 Merger (Note 3).

[4] In May 2012, we made a contribution of $7.9 million to the investment to repurchase a portion of its outstanding mortgage loan. In connection with the purchase, the entity recognized a net gain on extinguishment of debt of $5.9 million, of which our share was $1.9 million.