Annual report pursuant to Section 13 and 15(d)

Property Portfolio (Schedule of pro forma consolidated revenue, net loss, and earnings per share) (Details)

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Property Portfolio (Schedule of pro forma consolidated revenue, net loss, and earnings per share) (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Revenue $ 38,140 $ 28,559
Net income (loss) 1,828 (1,191)
Net income (loss) attributable to common stockholders $ 41 $ (1,191)
Income (loss) attributable to common stockholders per share - basic and diluted $ 0 $ (0.13)
Weighted average shares outstanding - basic and diluted 19,617 9,302