Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Sep. 27, 2014	Dec. 28, 2013
Allowance on trade accounts receivable	$ 4,687	$ 3,773
Allowance on other receivables	3,449	4,253
Accumulated depreciation and amortization on operating property	$ 157,379	$ 157,985
Common stock, par value	$ 0.01	$ 0.01
Common stock, authorized shares	160,000,000	160,000,000
Common stock, issued shares	67,211,626	67,017,858
Treasury stock, shares	22,474,331	21,528,693