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Earnings Per Share (EPS) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 01, 2016	Jul. 03, 2015	Jul. 01, 2016	Jul. 03, 2015
Net Income (Loss) Available to Common Stockholders, Diluted [Abstract]
Net income (loss)	$ (770)	$ 9,283	$ (13,430)	$ 17,291
Weighted Average Number of Shares Outstanding Reconciliation [Abstract]
Basic	30,767,000	25,473,000	30,743,000	25,369,000
Effect of dilutive securities stock options, restricted stock and restricted stock units	0	840,000	0	895,000
Denominator for diluted EPS	30,767,000	26,313,000	30,743,000	26,264,000
Basic EPS (in dollars per share)	$ (0.03)	$ 0.36	$ (0.44)	$ 0.68
Diluted EPS (in dollars per share)	$ (0.03)	$ 0.35	$ (0.44)	$ 0.66
Anitdilutive Securities Excluded From Earnings Per Share [Abstract]
Time-vested stock options, restricted stock and restricted stock units	1,916,000	276,000	1,916,000	297,000
Performance-vested stock options and restricted stock units	417,000	60,000	417,000	56,000

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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