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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, 2013	Sep. 28, 2013	Jun. 29, 2013	Mar. 30, 2013	Dec. 31, 2012	Sep. 29, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Numerator:
Net income	$ 26,575	$ 28,671	$ 32,308	$ 23,718	$ 19,786	$ 17,349	$ 18,014	$ 15,480	$ 111,272	$ 70,629	$ 40,015
Denominator:
Weighted average number of common shares outstanding - Basic									19,327,394	19,160,849	18,919,489
Dilutive effect of options and restricted stock units outstanding under the Company's employee compensation plans									613,324	474,392	232,909
Weighted average number of common shares outstanding - Diluted									19,940,718	19,635,241	19,152,398

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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