Revenue Recognition (Schedule of Changes in Contract Balances and Impacts of Entries to Adopt ASC 606) (Details) $ in Thousands	6 Months Ended
	Jul. 01, 2018 USD ($)
Accounts receivable, net
Beginning balance	$ 418,911	[1]
$ change	$ (75,028)
% change	(17.90%)
Ending balance	$ 343,883
Contract liabilities - current
Beginning balance	30,103	[1]
$ change	$ 571
% change	1.90%
Ending balance	$ 30,674
Contract liabilities - non-current
Beginning balance	13,839	[1]
$ change	$ 3,454
% change	25.00%
Ending balance	$ 17,293

[1] Includes the adjustments made to the contracts which were not completed at the date of ASC 606 adoption using the modified retrospective method.