Recent Accounting Standards - Reconciliation of Cash, Cash Equivalents and Restricted Cash (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 30, 2017	Apr. 01, 2017	[1]	Dec. 31, 2016	[1]
Accounting Changes and Error Corrections [Abstract]
Cash & cash equivalents	$ 91,573	$ 120,269
Restricted cash included within other current assets	2,080	6,189
Restricted cash included within other assets	105	105
Total cash, cash equivalents, and restricted cash	$ 93,758	$ 126,563	$ 157,446		$ 360,469

[1] The Condensed Consolidated Statement of Cash Flows for the quarter ended April 1, 2017 has been adjusted to reflect the adoption of ASU 2016-18, Statement of Cash Flows (Topic 230): Restricted Cash. The Condensed Consolidated Statements of Cash Flows reflects the changes during the periods in the total of cash, cash equivalents, and restricted cash. Therefore, restricted cash activity is included with cash when reconciling the beginning-of-period and end-of-period total amounts shown. Refer to Note 1 for further discussion.