Earnings Per Share (Narrative) (Details)	3 Months Ended
Mar. 31, 2013	Mar. 31, 2012
Earnings Per Share [Abstract]
Weighted average nonvested restricted shares outstanding	3,600,000	3,000,000
Weighted average number of OP units outstanding	281,000	810,000

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.

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+ Details