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Summary of Significant Accounting Policies: (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2011 count M | Dec. 31, 2010 | Dec. 31, 2009
Cash and Cash Equivalents and Restricted Cash: |  |  |
Maximum term of original maturity to classify instruments as cash equivalents (in months) | 3 |  |
Revenues |  |  |
Increase in rental revenue due to straight-line rent adjustment | $ 5,116 | $ 4,854 | $ 5,069
Investment in unconsolidated joint ventures |  |  |
Threshold ownership percentage above which to use equity method of accounting only if no controlling financial interest | 50.00% |  |
Acquisitions |  |  |
Number of forms of in-place operating lease intangible assets and liabilities (in counts) | 3 |  |
Minimum |  |  |
Revenues |  |  |
Management fees as a percentage of gross monthly rental revenue | 1.50% |  |
Deferred Charges: |  |  |
Deferred lease costs, amortization period (in years) | 1 |  |
Deferred financing costs, amortization period (in years) | 1 |  |
Leasing commissions and legal costs, amortization period (in years) | 5 |  |
Maximum |  |  |
Revenues |  |  |
Management fees as a percentage of gross monthly rental revenue | 5.00% |  |
Deferred Charges: |  |  |
Deferred lease costs, amortization period (in years) | 15 |  |
Deferred financing costs, amortization period (in years) | 15 |  |
Leasing commissions and legal costs, amortization period (in years) | 10 |  |
Buildings and improvements | Minimum |  |  |
Useful life of assets |  |  |
Estimated useful lives of assets (in years) | 5 |  |
Buildings and improvements | Maximum |  |  |
Useful life of assets |  |  |
Estimated useful lives of assets (in years) | 40 |  |
Tenant improvements | Minimum |  |  |
Useful life of assets |  |  |
Estimated useful lives of assets (in years) | 5 |  |
Tenant improvements | Maximum |  |  |
Useful life of assets |  |  |
Estimated useful lives of assets (in years) | 7 |  |
Equipment and furnishings | Minimum |  |  |
Useful life of assets |  |  |
Estimated useful lives of assets (in years) | 5 |  |
Equipment and furnishings | Maximum |  |  |
Useful life of assets |  |  |
Estimated useful lives of assets (in years) | 7 |  |

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