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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