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Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Real estate development $ 262,496 $ 248,265
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) 20,865,350 20,810,301
Common stock, outstanding shares (in shares) 20,865,350 20,810,301
Centennial    
Real estate development $ 92,194 $ 89,381