Net Income Per Share (Schedule of Net Income Per Share) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 29, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2018	Jul. 01, 2018	Apr. 01, 2018	Sep. 29, 2019	Sep. 30, 2018
Numerator:
Net income from continuing operations	$ 12,529			$ 16,310			$ 26,211	$ 17,861
Net (income) from discontinued operations	0			(7,160)			0	(8,351)
Net income	12,529			9,150			26,211	9,510
Net Income (Loss) Attributable to Noncontrolling Interest	0			(799)			0	(799)
Net income	$ 12,529	$ 839	$ 12,843	$ 9,949	$ (5,230)	$ 5,590	$ 26,211	$ 10,309
Denominator:
Weighted average common shares - basic (in shares)	30,933			31,802			31,221	31,634
Potentially dilutive common share equivalent (in shares)	886			1,172			1,106	1,192
Weighted average common shares - dilutive (in shares)	31,819			32,974			32,327	32,826
Earnings Per Share, Basic [Abstract]
Income per share - basic, continuing operations (in dollars per share)	$ 0.41			$ 0.51			$ 0.84	$ 0.56
Income per share - basic, discontinued operations (in dollars per share)	0			(0.20)			0	(0.23)
Net income per share - basic (in dollars per share)	0.41			0.31			0.84	0.33
Earnings Per Share, Diluted [Abstract]
Income per share - diluted, continuing operations (in dollars per share)	0.39			0.49			0.81	0.54
Income per share - diluted, discontinued operations (in dollars per share)	0			(0.19)			0	(0.23)
Net income per share - diluted (in dollars per share)	$ 0.39			$ 0.30			$ 0.81	$ 0.31
Anti-dilutive employee stock-based awards, excluded (in shares)	1,587			450			625	874