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Significant Accounting Policies (Narrative) (Details) (USD $)
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3 Months Ended | 6 Months Ended | |||||
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Jun. 30, 2012
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Dec. 31, 2011
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Jun. 30, 2011
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Jun. 30, 2012
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Jun. 30, 2011
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Jul. 05, 2012
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Jan. 05, 2012
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| Significant Accounting Policies [Abstract] | |||||||
| Capitalized development and construction salaries and other related costs | $ 770,000 | $ 909,000 | $ 1,570,000 | $ 1,979,000 | |||
| Rental property in-progress | 34,862,000 | 37,069,000 | 34,862,000 | ||||
| Maximum period after cessation of major construction activity that projects are considered complete | 1 year | ||||||
| Amortization of deferred financing costs | 661,000 | 584,000 | 1,272,000 | 1,168,000 | |||
| Deferred leasing costs | 1,060,000 | 982,000 | 2,156,000 | 2,036,000 | |||
| Minimum percentage of REIT taxable income distributed to shareholders | 90.00% | ||||||
| Common stock, shares outstanding | 87,819,278 | 87,799,479 | 87,819,278 | 87,819,863 | 87,800,047 | ||
| Common units outstanding | 12,177,122 | 12,197,122 | 12,177,122 | 12,177,122 | 12,197,122 | ||
| Distributions payable, record date | Jul. 05, 2012 | Jan. 05, 2012 | |||||
| Common unit distributions per share | $ 0.45 | $ 0.45 | |||||
| Common stock dividends and common unit distributions payable, date | Jul. 13, 2012 | Jan. 13, 2012 | |||||
| Restricted stock expense | $ 579,000 | $ 690,000 | $ 1,393,000 | $ 1,380,000 | |||