Stockholders' Equity (Narrative) (Details) - USD ($) $ in Thousands	6 Months Ended
	Jul. 01, 2018	Jul. 02, 2017
Stockholders' Equity Note [Abstract]
Shares remaining authorized for repurchase (in shares)	2,000,000
Stock repurchased (in shares)	0	1,100,000
Cost of stock repurchased		$ 56,600
Common stock repurchased to help administratively facilitate the withholding and subsequent remittance of personal income and payroll taxes for individuals receiving RSUs (in shares)	123,000	119,000
Cost of common stock repurchased to help administratively facilitate the withholding and subsequent remittance of personal income and payroll taxes for individuals receiving RSUs	$ 7,168	$ 5,649