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Earnings Per Share (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 27, 2014	Jun. 28, 2014	Mar. 29, 2014	Dec. 31, 2013	Sep. 28, 2013	Jun. 29, 2013	Mar. 30, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Numerator:
Net income	$ (14,758)us-gaap_NetIncomeLoss	$ 6,781us-gaap_NetIncomeLoss	$ 22,286us-gaap_NetIncomeLoss	$ 24,319us-gaap_NetIncomeLoss	$ 26,575us-gaap_NetIncomeLoss	$ 28,671us-gaap_NetIncomeLoss	$ 32,308us-gaap_NetIncomeLoss	$ 23,718us-gaap_NetIncomeLoss	$ 38,628us-gaap_NetIncomeLoss	$ 111,272us-gaap_NetIncomeLoss	$ 70,629us-gaap_NetIncomeLoss
Denominator:
Weighted average number of common shares outstanding - Basic									19,367,928us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	19,327,394us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	19,160,849us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Dilutive effect of options and restricted stock units outstanding under the Company's employee compensation plans									469,480us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	613,324us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	474,392us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
Weighted average number of common shares outstanding - Diluted									19,837,408us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	19,940,718us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	19,635,241us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding

X

- Definition

Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method.

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

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