Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Property and equipment, net	$ 151,781	$ 146,590
Common stock, par value	$ 0.50	$ 0.50
Common stock, Authorized shares	30,000,000	30,000,000
Common stock, Issued shares	21,131,845	20,085,865
Common stock, outstanding shares	21,131,845	20,085,865
Centennial Founders, LLC
Property and equipment, net	$ 72,787	$ 72,115