CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Dec. 30, 2017	Dec. 31, 2016
Allowance for Doubtful Accounts Receivable, Current	$ 13,182	$ 12,600
Less accumulated depreciation	(142,278)	(119,435)
Finite-Lived Intangible Assets, Accumulated Amortization	$ (207,334)	$ (168,369)
Preferred stock, par value (in usd per share)	$ 0.01	$ 0.01
Preferred Stock, Shares Authorized	2,000,000	2,000,000
Preferred stock, shares issued	0	0
Common Stock, Shares Authorized	95,000,000	95,000,000
Common stock, par value (in usd per share)	$ 0.01	$ 0.01
Common stock, shares issued	62,685,450	62,445,315
Treasury Stock, Shares	6,889,241	4,905,549