Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($) shares in Thousands, $ in Thousands	Mar. 25, 2020	Dec. 25, 2019
Assets [Abstract]
Accumulated depreciation	$ 151,140	$ 147,445
Accumulated amortization	$ 8,920	$ 8,468
Shareholders' 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	109,677	109,415
Common stock, shares outstanding	55,667	57,095
Treasury stock, at cost, shares	54,010	52,320