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Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Jun. 27, 2015	Dec. 27, 2014
Allowance on trade accounts receivable	$ 4,441	$ 4,338
Allowance on other receivables	4,304	4,189
Accumulated depreciation and amortization on operating property	$ 169,110	$ 160,681
Common stock, par value	$ 0.01	$ 0.01
Common stock, authorized shares	160,000,000	160,000,000
Common stock, issued shares	67,357,102	67,268,817
Treasury stock, shares	23,781,485	22,474,331

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- Definition

Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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The valuation allowance as of the balance sheet date to reduce the gross amount of receivables to estimated net realizable value, which would be presented in parentheses on the face of the balance sheet.

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