Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Jun. 27, 2020	Dec. 28, 2019
Allowance on trade accounts receivable	$ 8,580	$ 7,284
Allowance on other receivables	9,241	7,667
Accumulated depreciation and amortization on operating property	$ 288,055	$ 280,849
Common stock, par value	$ 0.01	$ 0.01
Common stock, authorized shares	160,000,000	160,000,000
Common stock, issued shares	68,176,787	68,083,419
Treasury stock, shares	29,797,328	28,609,926