Income Taxes Details (Details) - USD ($)	3 Months Ended	6 Months Ended	12 Months Ended
Jun. 29, 2018	Jun. 30, 2017	Jun. 29, 2018	Jun. 30, 2017	Dec. 31, 2017
Income Tax Disclosure [Abstract]
U.S. Federal Statutory Rate	21.00%	35.00%	21.00%	35.00%	35.00%
Tax Cuts and Jobs Act of 2017, Incomplete Accounting, GILTI Percentage			50.00%
Effective Income Tax Rate Reconciliation, Other Adjustments, Amount	$ 100,000			$ (700,000)
Tax Cuts and Jobs Act of 2017, Incomplete Accounting, Provisional Income Tax Expense (Benefit)			$ 4,400,000		$ 5,000,000
Income tax expense	$ 2,944,000	$ 1,726,000	$ 4,459,000	$ 1,603,000
Effective tax rate	20.90%	19.10%	17.00%	13.40%

Tax Cuts and Jobs Act of 2017, Incomplete Accounting, GILTI Percentage

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Tax Cuts and Jobs Act of 2017, Incomplete Accounting, Provisional Income Tax Expense (Benefit)

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to other adjustments.

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