Accounts Receivable [Abstract]

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Amounts due from customers or clients, within one year of the balance sheet date (or the normal operating cycle, whichever is longer) for goods or services (including trade receivables) that have been delivered or sold in the normal course of business.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
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A valuation allowance relating to a written agreement to receive money (at a specified future date(s) within one year from the reporting date (or the normal operating cycle, whichever is longer), consisting of principal as well as any accrued interest) for the portion that is expected to be uncollectible.

+ References

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-Publisher FASB
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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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- Definition

Carrying amounts due as of the balance sheet date of the sum of amounts receivable other than from customers.

+ References

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- Definition

An amount representing an agreement for an unconditional promise by the maker to pay the Entity (holder) a definite sum of money at a future date(s) within one year of the balance sheet date or the normal operating cycle, whichever is longer. Such amount may include accrued interest receivable in accordance with the terms of the debt. The debt also may contain provisions including a discount or premium, payable on demand, secured, or unsecured, interest bearing or noninterest bearing, among a myriad of other features and characteristics. This amount does not include amounts related to receivables held-for-sale.

+ References

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An amount representing an agreement for an unconditional promise by the maker to pay the Company (holder) a definite sum of money within one year from the balance sheet date (or the normal operating cycle, whichever is longer), net of any write-downs taken for collection uncertainty on the part of the holder. Such amount may include accrued interest receivable in accordance with the terms of the debt. The debt also may contain provisions and related items including a discount or premium, payable on demand, secured, or unsecured, interest bearing or noninterest bearing, among a myriad of other features and characteristics. This amount does not include amounts related to receivables held-for-sale.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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Accounts Receivable (Details) - USD ($) $ in Thousands	12 Months Ended
Accounts Receivable (Details) - USD ($) $ in Thousands	Dec. 25, 2016	Dec. 27, 2015	Dec. 31, 2014	Dec. 31, 2016	Dec. 31, 2015
Accounts Receivable [Abstract]
Trade receivables				$ 91,213	$ 103,202
Other receivables				9,037	10,253
Receivables, current				100,250	113,455
Allowance for doubtful accounts				(919)	(867)
Accounts receivable, net				$ 99,331	$ 112,588
Ford [Member] \| Customer Concentration Risk [Member]
Concentration Risk [Line Items]
Concentration Risk, Percentage	38.00%	44.00%	44.00%
General Motors [Member] \| Customer Concentration Risk [Member]
Concentration Risk [Line Items]
Concentration Risk, Percentage	30.00%	24.00%	24.00%
Toyota [Member] \| Customer Concentration Risk [Member]
Concentration Risk [Line Items]
Concentration Risk, Percentage	14.00%	14.00%	12.00%
Fiat Chrysler Automobiles [Member] \| Customer Concentration Risk [Member]
Concentration Risk [Line Items]
Concentration Risk, Percentage	6.00%	8.00%	10.00%
General Motors [Member] \| General Motors [Member] \| Customer Concentration Risk [Member]
Concentration Risk [Line Items]
Concentration Risk, Percentage	39.00%
Toyota [Member] \| Toyota [Member] \| Customer Concentration Risk [Member]
Concentration Risk [Line Items]
Concentration Risk, Percentage	14.00%
Ford [Member] \| Ford [Member] \| Customer Concentration Risk [Member]
Concentration Risk [Line Items]
Concentration Risk, Percentage	32.00%
Accounts Receivable [Member] \| Ford [Member] \| Customer Concentration Risk [Member]
Concentration Risk [Line Items]
Concentration Risk, Percentage		35.00%
Accounts Receivable [Member] \| General Motors [Member] \| Customer Concentration Risk [Member]
Concentration Risk [Line Items]
Concentration Risk, Percentage		27.00%
Accounts Receivable [Member] \| Toyota [Member] \| Customer Concentration Risk [Member]
Concentration Risk [Line Items]
Concentration Risk, Percentage		13.00%