Summary of Significant Accounting Policies Tax (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Deferred Tax Assets Gross	$ 38,700
Income and other tax (expense) benefit	1,613	$ 917	$ 1,394
Discontinued Operation, Tax Effect of Discontinued Operation	12	$ 15	$ 8
Operating Loss Carryforwards	$ 16,400
Tax Treatment Of Dividends And Distributions Ordinary Dividends	$ 0.722	$ 1.591	$ 1.475
Tax Treatment Of Dividends And Distributions Qualified Dividends	0.000	0.037	0.088
Tax Treatment Of Dividends And Distributions Long Term Capital Gain	9.176	0.443	0.280
Tax Treatment Of Dividends And Distributions Unrecaptured Section Twelve Hundred And Fifty Gain	3.117	0.139	0.157
Distributions declared per Common Share outstanding	$ 13.015	$ 2.210	$ 2.000
Land And Depreciable Property Net	$ 15,800,000	$ 17,000,000
Minimum [Member]
Operating Loss Carryforwards, Expiration Dates	Jan. 01, 2030
Maximum [Member]
Operating Loss Carryforwards, Expiration Dates	Dec. 31, 2032
Income, Franchise, and Exise Taxes [Member]
Income and other tax (expense) benefit	$ 1,613	917	$ 1,394
Discontinued Operation, Tax Effect of Discontinued Operation	12	15	8
Provision for income, franchise and excise taxes	$ 1,625	$ 932	$ 1,402