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Earnings (Loss) Per Share (EPS) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 29, 2018	Jun. 30, 2017	Jun. 29, 2018	Jun. 30, 2017
Earnings Per Share [Abstract]
Income from continuing operations	$ 23,056	$ 9,559	$ 36,140	$ 12,507
Loss from operations of discontinued operations	(3,034)	(6,569)	(8,000)	(13,856)
Net income (loss)	$ 20,022	$ 2,990	$ 28,140	$ (1,349)
Weighted Average Number of Shares Outstanding Reconciliation [Abstract]
Basic (in shares)	32,038,000	31,302,000	31,970,000	31,159,000
Stock options, restricted stock and restricted stock units (in shares)	682,000	680,000	602,000	674,000
Denominator for diluted EPS (in shares)	32,720,000	31,982,000	32,572,000	31,833,000
Basic earnings (loss) per share:
Income from continuing operations (in dollars per share)	$ 0.72	$ 0.31	$ 1.13	$ 0.40
Loss from discontinued operations (in dollars per share)	(0.09)	(0.21)	(0.25)	(0.44)
Basic (in dollars per share)	0.62	0.10	0.88	(0.04)
Diluted earnings (loss) per share:
Income from continuing operations (in dollars per share)	0.70	0.30	1.11	0.39
Loss from discontinued operations (in dollars per share)	(0.09)	(0.21)	(0.25)	(0.44)
Diluted (in dollars per share)	$ 0.61	$ 0.09	$ 0.86	$ (0.04)
Anitdilutive Securities Excluded From Earnings Per Share [Abstract]
Time-vested stock options, restricted stock and restricted stock units (in shares)	0	556,000	50,000	1,599,000
Performance-vested stock options and restricted stock units (in shares)	92,000	180,000	122,000	451,000

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