Segment and Geographic Area Information Net Sales by Geographic Area (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Segment Reporting Information [Line Items]
Net sales	$ 857,789	$ 754,866	$ 737,258	$ 722,063	$ 696,655	$ 654,010	$ 669,327	$ 657,211	$ 3,071,976	$ 2,677,203	$ 2,826,429
Sales in china to total net sales maximum percentage									15.00%	13.00%
Sales in any foreign country to total net sales maximum percentage									10.00%	10.00%	10.00%
United States
Segment Reporting Information [Line Items]
Net sales									$ 840,589	$ 797,267	$ 911,519
Foreign
Segment Reporting Information [Line Items]
Net sales									$ 2,231,387	$ 1,879,936	$ 1,914,910