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Condensed Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Allowance for doubtful notes receivable $ 119 $ 101
Common stock, par value (in dollars per share) $ 0.01 $ 0.01
Common stock, shares authorized (in shares) 200,000,000 200,000,000
Common stock, shares issued (in shares) 32,879,913 32,511,660
Common stock, shares outstanding (in shares) 32,879,913 32,511,660
Series B Preferred Stock    
Series B preferred stock, par value (in dollars per share) $ 0.01 $ 0.01
Series B preferred stock, shares issued (in shares) 4,965,850 4,965,850
Series B preferred stock, shares outstanding (in shares) 4,965,850 4,965,850
Series D Preferred Stock    
Preferred stock par value (in dollars per share) $ 0.01 $ 0.01
Preferred stock, shares authorized (in shares) 50,000,000 50,000,000
Preferred stock, shares issued (in shares) 1,600,000 1,600,000
Preferred stock, shares outstanding (in shares) 1,600,000 1,600,000