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Earnings (Loss) per Share/Unit (Details Textual) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Earnings Per Share [Abstract]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	3.0
Nonvested Restricted Shares of Common Stock with Non-forfeitable Dividend Rights	0.6	0.5	0.5
Method Used In Calculating Earnings Per Share	two-class method
Number of Sares of Cmmon Stock Required to Redeem Preferred OP Units Tendered for Redemption, if Parent Chooses to Redeem in Sares Rther than Cash	3.1

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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