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Earnings per Common Share (Computation of Basic and Diluted Earnings per Share) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Earnings Per Share [Abstract]
Debt Instrument, Interest Rate, Stated Percentage	3.875%
Income from continuing operations	$ 5,181	$ 2,119
Allocation of undistributed earnings to unvested restricted share awards	(188)	(21)
Adjusted income from continuing operations attributable to the controlling interests	4,993	2,098
Income from discontinued operations, including gain on sale of real estate, net of taxes	0	2,569
Net income attributable to noncontrolling interests in subsidiaries	0	(23)
Allocation of undistributed earnings to unvested restricted share awards	0	(25)
Adjusted income from discontinuing operations attributable to the controlling interests	0	2,521
Adjusted net income attributable to the controlling interests	$ 4,993	$ 4,619
Weighted average shares outstanding - basic	66,194	65,885
Effect of dilutive securities: Operating partnership units	117	0
Effect of dilutive securities: Employee stock options and restricted share awards	17	22
Weighted average shares outstanding - diluted	66,328	65,907
Earnings per common share, basic, Continuing operations	$ 0.08	$ 0.03
Earnings per common share, basic, Discontinued operations	$ 0.00	$ 0.04
Basic earnings: Adjusted net income attributable to the controlling interests - Per Share Amount	$ 0.08	$ 0.07
Earnings per common share, diluted, Continuing operations	$ 0.08	$ 0.03
Earnings per common share, diluted, Discontinued operations	$ 0.00	$ 0.04
Diluted earnings: Adjusted net income attributable to the controlling interests - Per Share Amount	$ 0.08	$ 0.07

X

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Interest rate stated in the contractual debt agreement.

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