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Earnings Per Share (Details)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Earnings Per Share [Abstract]
Weighted average nonvested restricted shares outstanding	3,300,000	2,300,000
Weighted average number of OP units outstanding	459,000	1,415,000	1,814,000

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- Definition

Weighted Average Number Of Operating Partnership Units Outstanding

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No definition available.

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- Definition

This element represents nonvested share-based payment awards that contain non-forfeitable rights to dividends or dividend equivalents (whether paid or unpaid). Basic and dilutive earnings per share are generally disclosed for such shares using the two-class method.

+ References

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

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