Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Jun. 28, 2014	Dec. 28, 2013
Allowance on trade accounts receivable	$ 4,442	$ 3,773
Allowance on other receivables	3,785	4,253
Accumulated depreciation and amortization on operating property	$ 160,434	$ 157,985
Common stock, par value	$ 0.01	$ 0.01
Common stock, authorized shares	160,000,000	160,000,000
Common stock, issued shares	67,162,401	67,017,858
Treasury stock, shares	22,471,704	21,528,693