Revenues (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 03, 2020	Sep. 28, 2019	Oct. 03, 2020	Sep. 28, 2019
Revenues
Revenues	$ 221,350	$ 223,294	$ 643,760	$ 618,116
Revenue from performance obligations that were satisfied in previous reporting periods	18,400	14,100	16,100	16,900
Distributors
Revenues
Revenues	172,476	163,556	502,955	448,864
Direct customers
Revenues
Revenues	48,874	59,738	140,805	169,252
Internet of Things
Revenues
Revenues	133,191	129,403	366,287	360,488
Infrastructure and automotive
Revenues
Revenues	$ 88,159	$ 93,891	$ 277,473	$ 257,628