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Real estate (Details 10) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Other income
Real Estate Properties [Line Items]
Reclassified results of operations	$ 21,148	$ 21,663	$ 22,751
Real estate expenses
Real Estate Properties [Line Items]
Reclassified results of operations	$ (22,603)	$ (24,297)	$ (25,612)

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- Definition

Reclassification of Results of Operations

+ References

No definition available.

+ Details

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Period Type:	duration

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- Details

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