Revenue Recognition (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 30, 2018	Jan. 01, 2018
Trade Accounts Receivable
Capitalized Contract Cost [Line Items]
Accounts Receivable, Trade	$ 130,367	$ 122,393
Change in Accounts Receivable, Trade	$ 7,974
Contract Asset Percent Change	7.00%
Unbilled Receivables
Capitalized Contract Cost [Line Items]
Unbilled Contracts Receivable	$ 2,981	2,658
Change in Unbilled Receivables	$ 323
Contract Asset Percent Change	12.00%
UnearnedRevenue
Capitalized Contract Cost [Line Items]
Deferred Revenue	$ 5,417	$ 5,451
Change in Unearned Revenue	$ (34)
Contract Liability Percent Change	(1.00%)

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Amount, before allowance for credit loss, of right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time, classified as current.

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Amount of deferred revenue as of balance sheet date. Deferred revenue represents collections of cash or other assets related to a revenue producing activity for which revenue has not yet been recognized. Generally, an entity records deferred revenue when it receives consideration from a customer before achieving certain criteria that must be met for revenue to be recognized in conformity with GAAP.

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The increase (decrease) during the reporting period, excluding the portion taken into income, in the liability reflecting revenue yet to be earned for which cash or other forms of consideration was received or recorded as a receivable.

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The increase (decrease) during the reporting period of the amount of revenue for work performed for which billing has not occurred, net of uncollectible accounts.

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Unbilled amounts due for services rendered or to be rendered, actions taken or to be taken, or a promise to refrain from taking certain actions in accordance with the terms of a legally binding agreement between the entity and, at a minimum, one other party. An example would be amounts associated with contracts or programs where the recognized revenue for performance thereunder exceeds the amounts billed under the terms thereof as of the date of the balance sheet.

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