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Condensed Statements of Income and Comprehensive Income (Parenthetical) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jul. 01, 2014
Jun. 30, 2015
Jul. 01, 2014
Condensed Consolidated Statements of Income and Comprehensive Income        
Unrealized gain on derivatives, tax $ 135 $ 124 $ 262 $ 237
Foreign currency translation adjustment, tax $ 4   $ 11