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Revenue Recognition (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2018 USD ($) day	Apr. 01, 2017 USD ($)
Disaggregation of Revenue [Line Items]
Standard terms of payment, number of days | day	10
Net sales	$ 437,487	$ 428,608
Warehouse
Disaggregation of Revenue [Line Items]
Net sales	333,305	319,431
Direct
Disaggregation of Revenue [Line Items]
Net sales	82,942	87,511
Reload and service revenue
Disaggregation of Revenue [Line Items]
Net sales	28,270	28,387
Variable consideration
Disaggregation of Revenue [Line Items]
Net sales	(7,030)	(6,721)
Structural products
Disaggregation of Revenue [Line Items]
Net sales	206,397	190,713
Specialty products
Disaggregation of Revenue [Line Items]
Net sales	231,481	239,119
Other
Disaggregation of Revenue [Line Items]
Net sales	$ (391)	$ (1,224)

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Contract With Customer, Standard Terms Of Payment, Number Of Days

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 32
-Paragraph 2A
-URI http://asc.fasb.org/extlink&oid=82859839&loc=SL82860478-203043

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-Publisher FASB
-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=82913847&loc=SL49130539-203045

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