Revenue (Schedule of Changes in Contract Balances) (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 29, 2019	Dec. 31, 2018
Accounts Receivable, net
Accounts receivable, net	$ 248,070	$ 303,667
$ change	$ (55,597)
% change	(18.30%)
Contract liabilities - current
Contract liabilities - current	$ 5,812	11,086
$ change	$ (5,274)
% change	(47.60%)
Contract liabilities - non-current
Contract liabilities - non-current	$ 1,900	$ 779
$ change	$ 1,121
% change	143.90%