Significant Accounting Policies – Accounting Standards Adopted (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 24, 2017	Sep. 25, 2016
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net cash provided by operating activities	$ 114,917	$ 121,456
Net cash used in financing activities	$ 48,810	77,526
Accounting Standards Update 2016-09 | Restatement
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net cash provided by operating activities		5,500
Net cash used in financing activities		$ 5,500