Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Sep. 26, 2015	Dec. 31, 2014
Trade accounts and notes receivable, allowance for doubtful accounts	$ 1,414	$ 1,827
Property, plant and equipment, accumulated depreciation	331,265	315,949
Intangible assets, Accumulated amortization	$ 182,443	$ 146,535
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	140,561,354	139,792,583
Common stock, shares outstanding	140,561,354	139,792,583