Significant Accounting Policies - Revenue Recognition (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jul. 01, 2017	Jun. 30, 2018	Jul. 01, 2017	Dec. 31, 2017	Dec. 30, 2017
Condensed Consolidated Statements of Cash Flows
Accounts receivable, net			$ 16,705	$ 887
Prepaid expenses and other current assets			1,759	(12,539)
Deferred revenue and returns liability			(4,193)	3,251
Condensed Consolidated Statements of Income
Cost of revenues	$ 85,814	$ 76,906	166,961	150,773
Net income	$ 14,280	$ 16,569	$ 40,685	$ 31,995
Earnings per share:
Basic (in dollars per share)	$ 0.33	$ 0.39	$ 0.94	$ 0.76
Diluted (in dollars per share)	$ 0.32	$ 0.38	$ 0.92	$ 0.74
Condensed Consolidated Balance Sheet
Prepaid expenses and other current assets	$ 52,642		$ 52,642			$ 39,120
Goodwill	396,689		396,689			288,227
Other assets, net	95,385		95,385			88,387
Deferred revenue and returns liability	24,503		24,503
Deferred income on shipments to distributors						50,115
Other current liabilities	74,254		74,254			73,359
Retained earnings	918,440		$ 918,440			$ 851,307
Performance Obligations
Product replacement warranty			1 year
ASU 2014-09 - Revenue from Contracts with Customers
Condensed Consolidated Statements of Cash Flows
Accounts receivable, net			$ 230
Prepaid expenses and other current assets			7,579
Other assets, net			(2,282)
Deferred revenue and returns liability			27,806
Deferred income on shipments to distributors			(50,115)
Other current liabilities			1,641
Retained earnings			26,195
Condensed Consolidated Statements of Income
Revenue	7,464		8,162
Cost of revenues	2,233		1,983
Net income	$ 4,507		$ 4,897
Earnings per share:
Basic (in dollars per share)	$ 0.10		$ 0.11
Diluted (in dollars per share)	$ 0.10		$ 0.11
Condensed Consolidated Balance Sheet
Prepaid expenses and other current assets	$ 2,959		$ 2,959
Goodwill	(2,842)		(2,842)
Other assets, net	(3,559)		(3,559)
Deferred revenue and returns liability	24,503		24,503
Deferred income on shipments to distributors	(64,936)		(64,936)
Other current liabilities	5,485		5,485
Retained earnings	$ 31,092		$ 31,092		$ 26,200