Revenue Recognition (Schedule of Changes in Contract Balances and Impacts of Entries to Adopt ASC 606) (Details) $ in Thousands	3 Months Ended
	Apr. 01, 2018 USD ($)
Accounts Receivable, net
Beginning balance	$ 418,911	[1]
$ change	$ (101,809)
% change	(24.30%)
Ending balance	$ 317,102
Contract liabilities - current
Beginning balance	30,103	[1]
$ change	$ 882
% change	2.90%
Ending balance	$ 30,985
Contract liabilities - non-current
Beginning balance	13,839	[1]
$ change	$ 1,670
% change	12.10%
Ending balance	$ 15,509

[1] Includes the adjustments made to all open contracts at the date of ASC 606 adoption using the modified retrospective method.