Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Mar. 29, 2014	Dec. 28, 2013
Allowance on trade accounts receivable	$ 3,594	$ 3,773
Allowance on other receivables	4,212	4,253
Accumulated depreciation and amortization on operating property	$ 160,307	$ 157,985
Common stock, par value	$ 0.01	$ 0.01
Common stock, authorized shares	160,000,000	160,000,000
Common stock, issued shares	67,121,124	67,017,858
Treasury stock, shares	22,168,803	21,528,693