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Summary of Significant Accounting Policies Tax (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Deferred Tax Assets Gross $ 40,800    
Income and other tax (expense) benefit 917 $ 1,394 $ 1,169
Discontinued Operation, Tax Effect of Discontinued Operation 15 $ 8 $ 449
Operating Loss Carryforwards $ 19,400    
Tax Treatment Of Dividends And Distributions Ordinary Dividends $ 1.591 $ 1.475 $ 0.662
Tax Treatment Of Dividends And Distributions Qualified Dividends 0.037 0.088 0.050
Tax Treatment Of Dividends And Distributions Long Term Capital Gain 0.443 0.280 0.870
Tax Treatment Of Dividends And Distributions Unrecaptured Section Twelve Hundred And Fifty Gain 0.139 0.157 0.268
Distributions declared per Common Share outstanding $ 2.210 $ 2.000 $ 1.850
Land And Depreciable Property Net $ 17,000,000 $ 16,700,000  
Income, Franchise, and Exise Taxes [Member]      
Income and other tax (expense) benefit 917 1,394 $ 1,169
Discontinued Operation, Tax Effect of Discontinued Operation 15 8 449
Provision for income, franchise and excise taxes $ 932 $ 1,402 $ 1,618
Minimum [Member]      
Operating Loss Carryforwards, Expiration Dates Jan. 01, 2030    
Maximum [Member]      
Operating Loss Carryforwards, Expiration Dates Dec. 31, 2032