Net Income Per Share (Schedule of Net Income Per Share) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2019	Apr. 01, 2018
Numerator:
Net income from continuing operations	$ 12,843	$ 1,018
Net (income) from discontinued operations	0	4,572
Net income	$ 12,843	$ 5,590
Denominator:
Weighted average common shares - basic (in shares)	31,483	31,427
Potentially dilutive common share equivalent (in shares)	1,391	1,233
Weighted average common shares - dilutive (in shares)	32,874	32,660
Earnings Per Share, Basic [Abstract]
Income per share - basic, continuing operations (in dollars per share)	$ 0.41	$ 0.03
Income per share - basic, discontinued operations (in dollars per share)	0.00	0.15
Net income per share - basic (in dollars per share)	0.41	0.18
Earnings Per Share, Diluted [Abstract]
Income per share - diluted, continuing operations (in dollars per share)	0.39	0.03
Income per share - diluted, discontinued operations (in dollars per share)	0.00	0.14
Net income per share - diluted (in dollars per share)	$ 0.39	$ 0.17
Anti-dilutive employee stock-based awards, excluded (in shares)	507	773