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Income Taxes: (Details) - USD ($) $ / shares in Units, $ in Thousands |  |  | 12 Months Ended
--- | --- | --- | ---
Dec. 08, 2015 | Oct. 30, 2015 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Income Tax Disclosure [Abstract] |  |  |  |  |
Common Stock, Dividends, Per Share, Cash Deemed Paid, Income Tax Purposes |  |  | $ 0.21 |  |
Common stock dividend distribution |  |  |  |  |
Ordinary income (in dollars per share) |  |  | 1.20 | $ 1.92 | $ 1.02
Capital gains (in dollars per share) |  |  | 3.64 | 0.16 | 1.24
Unrecaptured Section 1250 gain (in dollars per share) |  |  | 0.00 | 0.05 | 0.10
Return of capital (in dollars per share) |  |  | 0.00 | 0.38 | 0.00
Dividends paid for income tax purposes |  |  | 4.84 |  |
Dividends paid (in dollars per share) | $ 2.00 |  | $ 4.63 | $ 2.51 | $ 2.36
Ordinary income (as a percent) |  |  | 24.80% | 76.50% | 43.30%
Capital gains (as a percent) |  |  | 75.20% | 6.40% | 52.50%
Unrecaptured Section 1250 gain (as a percent) |  |  | 0.00% | 2.00% | 4.20%
Return of capital (as a percent) |  |  | 0.00% | 15.10% | 0.00%
Dividends paid (as a percent) |  |  | 100.00% | 100.00% | 100.00%
Dividends declared for common stock |  | $ 2.00 | $ 6.63 |  |
Income tax benefit |  |  |  |  |
Current |  |  | $ 0 | $ 0 | $ (142)
Deferred |  |  | 3,223 | 4,269 | 1,834
Income tax benefit |  |  | 3,223 | 4,269 | 1,692
Reconciliation of income tax benefit (provision) of the TRSs |  |  |  |  |
Book loss for TRSs |  |  | 10,681 | 10,785 | 11,709
Tax at statutory rate on earnings from continuing operations before income taxes |  |  | 3,632 | 3,667 | 3,981
Other |  |  | (409) | 602 | (2,289)
Income tax benefit |  |  | 3,223 | 4,269 | $ 1,692
Components of net deferred tax assets |  |  |  |  |
Net operating loss carryforwards |  |  | 25,340 | 24,698 |
Property, primarily differences in depreciation and amortization, the tax basis of land assets and treatment of certain other costs |  |  | 10,600 | 8,201 |
Other |  |  | 2,907 | 2,726 |
Deferred tax assets |  |  | $ 38,847 | $ 35,625 |

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