Condensed Consolidated Balance Sheets (Parenthetical) - USD ($)	Jul. 02, 2016	Dec. 31, 2015
Trade accounts and notes receivable, allowance for doubtful accounts	$ 2,282,000	$ 1,318,000
Property, plant and equipment, accumulated depreciation	368,470,000	341,840,000
Intangible assets, Accumulated amortization	216,071,000	193,884,000
Unamortized discount and debt issuance costs	$ 11,615,000	$ 12,807,000
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	141,171,882	140,716,420
Common stock, shares outstanding	141,171,882	140,716,420