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Significant Accounting Policies (Narrative) (Details) (USD $)
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3 Months Ended | 12 Months Ended | |||||||
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Dec. 31, 2011
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Dec. 31, 2010
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Dec. 31, 2011
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Dec. 31, 2010
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Dec. 31, 2009
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Jan. 05, 2012
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Oct. 27, 2011
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Jan. 05, 2011
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Dec. 31, 2008
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| Significant Accounting Policies [Abstract] | |||||||||
| Rental property in-progress | $ 37,069,000 | $ 65,990,000 | $ 37,069,000 | $ 65,990,000 | |||||
| Amortization of deferred financing costs | 2,370,000 | 2,656,000 | 2,730,000 | ||||||
| Deferred leasing costs | 4,432,000 | 3,986,000 | 3,725,000 | ||||||
| Minimum percentage of REIT taxable income distributed to shareholders | 90.00% | ||||||||
| Preferred stock, shares outstanding | 0 | 10,000 | 0 | 10,000 | 10,000 | 10,000 | |||
| Common stock, shares outstanding | 87,799,479 | 79,605,474 | 87,799,479 | 79,605,474 | 87,800,047 | 79,605,542 | |||
| Common units outstanding | 12,197,122 | 13,007,668 | 12,197,122 | 13,007,668 | 13,495,036 | 12,197,122 | 13,007,668 | 14,437,731 | |
| Preferred stock dividends per share declared | $ 50.00 | ||||||||
| Common unit distributions per share | $ 0.45 | $ 0.45 | |||||||
| Dividend paid per common share | $ 1.80 | $ 1.80 | $ 1.99 | ||||||
| Dividends paid, percent representing ordinary income | 77.00% | 75.00% | 93.00% | ||||||
| Dividends paid, percent representing return of capital to shareholders | 23.00% | 25.00% | 7.00% | ||||||
| Restricted stock expense | $ 4,123,000 | $ 4,121,000 | $ 4,097,000 | ||||||