Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Common stock, par value per share	$ 0.50	$ 0.50
Common stock, authorized shares	30,000,000	30,000,000
Common stock, issued shares	20,661,590	20,636,478
Common stock, outstanding shares	20,661,590	20,636,478
Real estate developments	$ 224,733	$ 219,654
Centennial Founders, LLC
Real estate developments	$ 78,555	$ 77,131