Equity Investments in Real Estate (Narratives) (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Equity Investments in Real Estate
Net income from equity investments in real estate	$ 1,733,000	$ 3,888,000	$ 2,867,000	$ 4,267,000
Footnote Details
Non recourse debt	118,400,000		118,400,000
Capital contributions to equity investments			51,439,000	7,890,000
Net income from equity investments in real estate	1,733,000	3,888,000	2,867,000	4,267,000
Hellweg Die Profi Baumarkt Gmbh And Co KG
Footnote Details
Equity method investments, distributions (return of capital)			1,100,000	1,400,000
Berry Plastics Corporation
Footnote Details
Equity method investments, distributions (return of capital)			1,200,000	1,100,000
C1000 Logistiek Vastgooed B.V
Footnote Details
Equity method investments, distributions (return of capital)			3,300,000	5,500,000
Equity method investment, additional information			For this investment, the co-obligor is WPC and the total amount due under the arrangement was approximately $90.4 million at June 30, 2013. Of this amount, $77.7 million represents the amount we agreed to pay and is included within the carrying value of this investment.
Shelborne
Footnote Details
Capitalized funds			24,100,000
Unfunded commitments	41,300,000		41,300,000
I-Drive Live
Footnote Details
Capitalized funds			3,600,000
Unfunded commitments	$ 44,600,000		$ 44,600,000