Condensed Consolidated Statements of Comprehensive Income (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 29, 2015	Mar. 30, 2014
Statement of Comprehensive Income [Abstract]
Net income	$ 6,305us-gaap_NetIncomeLoss	$ 2,465us-gaap_NetIncomeLoss
Other comprehensive income (loss)
Changes in foreign currency translation adjustments	(1,534)	(616)
Other comprehensive income (loss)	(1,534)	(616)
Comprehensive income	$ 4,771us-gaap_ComprehensiveIncomeNetOfTax	$ 1,849us-gaap_ComprehensiveIncomeNetOfTax

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

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Data Type:	xbrli:monetaryItemType
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