Revenues - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jul. 01, 2018	Apr. 01, 2018	Dec. 31, 2017	Oct. 01, 2017	Jul. 02, 2017	Apr. 02, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Jan. 01, 2018
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Increase (decrease) in retained earnings	$ 922,000				$ 833,610				$ 922,000	$ 833,610
Decrease in revenues	(655,390)	$ (655,774)	$ (668,639)	$ (605,565)	(604,884)	$ (621,745)	$ (610,633)	$ (551,381)	(2,585,368)	(2,388,643)	$ (2,356,672)
Accrued rebates	41,312				$ 38,025				41,312	$ 38,025
Accrued returns	11,900								11,900
Estimated price adjustments, accounts receivable									25,100
Contract with customer, deferred revenues	113,300								113,300			$ 104,400
Deferred Revenue, Additions									202,100
Contract with customer, revenue recognized									193,200
Contract with customer, deferred revenues, current	101,200								101,200
Contract with customer, deferred revenues, noncurrent	12,100								12,100
Deferred sales commission	$ 2,900								2,900
Sales commissions									23,300
Accounting Standards Update 2014-09
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Increase (decrease) in retained earnings												$ 2,600
Decrease in revenues									$ 0