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Net Investments in Properties and Real Estate Under Construction (Details 2) (USD $) In Thousands, unless otherwise specified	9 Months Ended	12 Months Ended
	Sep. 30, 2012	Dec. 31, 2011
Asset Retirement Obligation
Balance - beginning of period	$ 11,453	$ 1,508
Additions	3,684	9,562
Accretion expense	394	250
Foreign currency translation adjustments and other	292	133
Balance - end of period	$ 15,823	$ 11,453

- Definition

Amount recognized for the passage of time, typically for liabilities, that have been discounted to their net present values. Excludes accretion associated with asset retirement obligations.

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