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Income Taxes - Unrecognized Tax Losses (Details) - USD ($)
 12 Months Ended
Dec. 31, 2016
Jan. 02, 2016
Changes in the balances of gross unrecognized tax benefits    
Balance at beginning of period $ 1,265,000 $ 535,000
Reductions for tax positions taken during prior years (21,000)  
Additions for tax positions taken during the current year 82,000 892,000
Settlements with tax authorities (267,000) (162,000)
Balance at end of the period 1,059,000 1,265,000
Interest accrued on unrecognized tax benefits 121,000  
Unrecognized tax benefits before adjustments 1,180,000  
Unrecognized tax benefits offset by future tax deduction 97,000  
Interest and penalties on unrecognized tax benefits 20,000 $ 18,000
Unrecognized tax benefits being recognized as a reduction to the effective income tax rate 874,000  
Amount of unrecognized tax benefits that was expected to be reversed within the next twelve months 74,000  
Additional disclosures    
Undistributed earnings from foreign subsidiaries $ 4,000,000