Stockholders' Equity (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended
	Apr. 01, 2018	Apr. 02, 2017
Stockholders' Equity Note [Abstract]
Shares remaining authorized for repurchase (in shares)	2,000,000
Stock repurchased (in shares)	0	200,000
Cost of stock repurchased		$ 11,600
Common stock repurchased to help administratively facilitate the withholding and subsequent remittance of personal income and payroll taxes for individuals receiving RSUs (in shares)	38,000	38,000
Cost of common stock repurchased to help administratively facilitate the withholding and subsequent remittance of personal income and payroll taxes for individuals receiving RSUs	$ 2,271	$ 1,936