Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Apr. 01, 2017	Dec. 31, 2016
Trade accounts and notes receivable, allowance for doubtful accounts	$ 2,249	$ 2,474
Property, plant and equipment, accumulated depreciation	398,667	387,523
Intangible assets, Accumulated amortization	249,110	237,207
Unamortized discount and debt issuance costs	$ 8,535	$ 9,173
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, shares authorized	5,000,000	5,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	400,000,000	400,000,000
Common stock, shares issued	141,710,104	141,319,964
Common stock, shares outstanding	141,710,104	141,319,964