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CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($)
$ in Thousands
Dec. 25, 2016
Dec. 27, 2015
Accounts receivable, allowances $ 16,815 $ 13,485
Common stock, par value (USD per share) $ 0.1 $ 0.1
Class A Common Stock    
Authorized shares (in shares) 300,000,000 300,000,000
Issued shares (in shares) 169,206,879 168,263,533
Treasury shares (in shares) 8,870,801 7,691,129
Class B Common Stock    
Authorized shares (in shares) 816,632 816,635
Issued shares (in shares) 816,632 816,635
Treasury shares (in shares) 0 0