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Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Real estate development $ 280,355 $ 267,336
Common stock, par value per share (in dollars per share) $ 0.50 $ 0.50
Common stock, authorized shares (in shares) 30,000,000 30,000,000
Common stock, issued shares (in shares) 25,960,262 25,894,773
Common stock, outstanding shares (in shares) 25,960,262 25,894,773
Centennial    
Real estate development $ 98,203 $ 94,271