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Income Taxes: (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified | 12 Months Ended
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Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
Common stock dividend distribution |  |  |
Ordinary income (in dollars per share) | $ 0.85 | $ 0.57 | $ 0.09
Capital gains (in dollars per share) | $ 0.01 | $ 0.04 | $ 1.12
Unrecaptured Section 1250 gain (in dollars per share) | $ 0.04 |  | $ 0.93
Return of capital (in dollars per share) | $ 1.15 | $ 1.49 | $ 0.46
Dividends paid (in dollars per share) | $ 2.05 | $ 2.10 | $ 2.60
Ordinary income (as a percent) | 41.50% | 27.10% | 3.30%
Qualified dividends (as a percent) | 0.00% | 0.00% | 0.00%
Capital gains (as a percent) | 0.50% | 1.90% | 43.20%
Unrecaptured Section 1250 gain (as a percent) | 2.00% | 0.00% | 35.80%
Return of capital (as a percent) | 56.00% | 71.00% | 17.70%
Dividends paid (as a percent) | 100.00% | 100.00% | 100.00%
Income tax benefit (provision) |  |  |
Current |  | $ (11) | $ (264)
Deferred | 6,110 | 9,213 | 5,025
Income tax benefit | (6,110) | (9,202) | (4,761)
Reconciliation of income tax benefit (provision) of the TRSs |  |  |
Book (loss) income for TRSs | (19,558) | (19,896) | (15,371)
Tax at statutory rate on earnings from continuing operations before income taxes | (6,650) | (6,765) | (5,226)
Other | 540 | (2,437) | 465
Income tax benefit (provision) | 6,110 | 9,202 | 4,761
Components of net deferred tax assets |  |  |
Net operating loss carryforwards | 29,045 | 20,292 |
Property, primarily differences in depreciation and amortization, the tax basis of land assets and treatment of certain other assets costs | (4,442) | (3,097) |
Other | 2,226 | 2,330 |
Net deferred tax assets | 26,829 | 19,525 |
Reconciliation of unrecognized tax benefits |  |  |
Unrecognized tax benefits at beginning of year |  | 2,420 | 2,201
Gross increases for tax positions of current year |  |  | 651
Gross decreases for tax positions of current year |  | (2,420) | (432)
Unrecognized tax benefits at end of year |  |  | $ 2,420

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