Quarterly Financial Data (unaudited) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 28, 2019	Jun. 29, 2019	Mar. 30, 2019	Dec. 31, 2018	Sep. 29, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Consolidated Statement of Operations:
Net revenues	$ 1,068,561	$ 1,091,953	$ 1,118,987	$ 1,010,260	$ 1,091,739	$ 1,136,478	$ 1,172,465	$ 946,165	$ 4,289,761	$ 4,346,847	$ 3,763,749
Gross margin	200,406	223,785	240,219	208,129	224,373	241,475	248,102	204,586	872,539	918,536	847,517
Operating income (loss)	37,778	54,426	57,900	40,310	52,755	7,293	70,264	36,730	190,414	167,042	261,457
Income before taxes and equity earnings	19,840	39,542	34,537	26,126	41,173	(3,049)	57,449	35,538	120,045	131,111	142,301
Net income	$ 7,796	$ 17,042	$ 22,356	$ 15,777	$ 38,090	$ 28,637	$ 34,776	$ 40,404	$ 62,971	$ 141,907	$ 8,122
Net income per share - basic (usd per share)	$ 0.08	$ 0.17	$ 0.22	$ 0.16	$ 0.37	$ 0.27	$ 0.33	$ 0.38	$ 0.63	$ 1.36	$ (0.02)
Net income per share - diluted (usd per share)	$ 0.08	$ 0.17	$ 0.22	$ 0.16	$ 0.37	$ 0.27	$ 0.32	$ 0.37	$ 0.62	$ 1.33	$ (0.02)