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Condensed Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Allowance for doubtful notes receivable $ 128 $ 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) 32,900,422 32,511,660
Common stock, shares outstanding (in shares) 32,900,422 32,511,660
Preferred stock par value (in dollars per share) $ 0.01 $ 0.01
Preferred stock, shares authorized (in shares) 50,000,000 50,000,000
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, shares issued (in shares) 1,600,000 1,600,000
Preferred stock, shares outstanding (in shares) 1,600,000 1,600,000