Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($)
$ in Thousands
3 Months Ended
Mar. 30, 2018
Mar. 31, 2017
Net income $ 6,111 $ 6,668
Changes in derivative instrument:    
Net gain reclassified to interest expense 1 1
Tax expense (113) (44)
Net change in derivative instruments 403 80
Foreign currency translation adjustments, net of tax 487 127
Other comprehensive income, net of tax 890 207
Total comprehensive income 7,001 6,875
Interest Rate Swap    
Changes in derivative instrument:    
Net change in fair value of interest rate swap 520 123
Foreign Exchange Forward    
Changes in derivative instrument:    
Net change in fair value of interest rate swap $ (5) $ 0