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Significant Accounting Policies (Narrative) (Details) (USD $)
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3 Months Ended | ||||
|---|---|---|---|---|---|
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Mar. 31, 2012
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Dec. 31, 2011
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Mar. 31, 2011
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Apr. 04, 2012
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Jan. 05, 2012
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| Significant Accounting Policies [Abstract] | |||||
| Rental property in-progress | $ 31,212,000 | $ 37,069,000 | |||
| Amortization of deferred financing costs | 611,000 | 584,000 | |||
| Deferred leasing costs | 1,096,000 | 1,054,000 | |||
| Minimum percentage of REIT taxable income distributed to shareholders | 90.00% | ||||
| Common stock, shares outstanding | 87,811,226 | 87,799,479 | 87,811,690 | 87,800,047 | |
| Common units outstanding | 12,187,122 | 12,197,122 | 12,187,122 | 12,197,122 | |
| Common unit distributions per share | $ 0.45 | $ 0.45 | |||
| Restricted stock expense | $ 814,000 | $ 691,000 | |||
| Common stock dividends and common unit distributions payable, date | Apr. 13, 2012 | Jan. 13, 2012 | |||