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Summary of Significant Accounting Policies: (Details 2) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2011 Y segment location | Dec. 31, 2010 | Dec. 31, 2009
Variable interest entities included in the consolidated financial statements |  |  |
Redemption of noncontrolling interests | $ (42) | $ (193) | $ (397)
Income Taxes: |  |  |
Minimum percentage of taxable income distribution to stockholders to qualify as REIT | 90.00% |  |
Period for which entity could be disqualified as REIT (in years) | 4 |  |
Segment Information: |  |  |
Number of business segments | 1 |  |
Number of geographic areas in which the Company operates | 1 |  |
Concentration of Risk: |  |  |
Maximum guarantee provided by Federal Deposit Insurance Corporation on cash held in banks | $ 250 |  |

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