CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) shares in Thousands, $ in Thousands	Mar. 30, 2019	Dec. 29, 2018
Accounts receivable, reserve for doubtful accounts	$ 13,844	$ 13,608
Property, plant and equipment, accumulated depreciation	174,640	167,737
Finite-Lived Intangible Assets, Accumulated Amortization	$ 284,869	$ 268,414
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, shares issued	62,597,716	62,592,707
Treasury stock, shares	6,933,618	6,889,241