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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 | ||||||
| X | ||||||||||
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- Definition
Common Stock Dividends Per Share Paid, Percent Representing Ordinary Income No definition available.
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| X | ||||||||||
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- Definition
Common Stock Dividends Per Share Paid Percent Representing Return Of Capital To Stockholders No definition available.
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| X | ||||||||||
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- Definition
Common Unit Distributions Per Unit Declared No definition available.
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| X | ||||||||||
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- Definition
The number of common units outstanding. No definition available.
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| X | ||||||||||
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- Definition
Minimum percentage of taxable income required to be distributed to shareholders. No definition available.
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| X | ||||||||||
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- Details
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| X | ||||||||||
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- Definition
This element represents the amortization of deferred leasing fees incurred by the lessor and amortized over the term of the lease. Such fees represent (a) costs to originate a lease incurred in transactions with independent third parties that (i) result directly from and are essential to acquire that lease and (ii) would not have been incurred had that leasing transaction not occurred and (b) certain costs directly related to specified activities performed by the lessor for that lease. Those activities are: evaluating the prospective lessee's financial condition; evaluating and recording guarantees, collateral, and other security arrangements; negotiating lease terms; preparing and processing lease documents; and closing the transaction. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The component of interest expense comprised of the periodic charge against earnings over the life of the financing arrangement to which such costs relate. Alternate captions include Noncash Interest Expense. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Aggregate dividends paid during the period for each share of common stock outstanding. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Total number of shares of common stock held by shareholders. May be all or portion of the number of common shares authorized. These shares represent the ownership interest of the common shareholders. Shares outstanding equals shares issued minus shares held in treasury and other adjustments, if any. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Gross amount, at the balance sheet date, of long-lived assets under construction that include construction costs to date on capital projects that have not been completed and assets being constructed that are not ready to be placed into service. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Aggregate dividends declared during the period for each share of preferred stock outstanding. No definition available.
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| X | ||||||||||
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- Definition
Aggregate share number for all nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer) held by stockholders. Does not include preferred shares that have been repurchased. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The noncash expense that represents the cost of restricted stock or unit distributed to employees as compensation. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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