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Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($)
shares in Thousands, $ in Thousands
Jun. 29, 2016
Dec. 30, 2015
Assets [Abstract]    
Accumulated depreciation $ 251,129 $ 247,995
Shareholders' equity (deficit)    
Common stock, par value (in dollars per share) $ 0.01 $ 0.01
Common stock, shares authorized 135,000 135,000
Common stock, shares issued 106,981 106,521
Common stock, shares outstanding 76,560 76,862
Treasury stock, at cost, shares 30,421 29,659