Equity Investments in Real Estate (Narratives) (Details) (USD $)	3 Months Ended
Mar. 31, 2013	Mar. 31, 2012
Equity Investments in Real Estate
Net income from equity investments in real estate	$ 1,133,000	$ 379,000
Footnote Details
Capital contributions to equity investments	10,385,000	0
Net income from equity investments in real estate	1,133,000	379,000
Hellweg Die Profi Baumarkt Gmbh And Co KG
Footnote Details
Equity method investments, distributions (return of capital)	900,000
Berry Plastics Corporation
Footnote Details
Equity method investments, distributions (return of capital)	600,000
C1000 Logistiek Vastgooed B.V
Footnote Details
Equity method investments, distributions (return of capital)	1,400,000
Equity method investment, additional information	For this investment, the co-obligor is the advisor and the total amount due under the arrangement is approximately $90.4 million. 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
Payments for construction in progress	9,700,000
Unfunded commitments	55,000,000
I-Drive Live
Footnote Details
Unfunded commitments	$ 48,200,000

This item represents the entity's proportionate share for the period of the net income (loss) of its investee (such as unconsolidated subsidiaries and joint ventures) to which the equity method of accounting is applied. This item includes income or expense related to stock-based compensation based on the investor's grant of stock to employees of an equity method investee.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

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Reference 2: http://www.xbrl.org/2003/role/presentationRef

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Reference 3: http://www.xbrl.org/2003/role/presentationRef

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Reference 4: http://www.xbrl.org/2003/role/presentationRef

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Reference 5: http://www.xbrl.org/2003/role/presentationRef

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Reference 6: http://www.xbrl.org/2003/role/presentationRef

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Reference 8: http://www.xbrl.org/2003/role/presentationRef

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