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Revenue Recognition (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018 USD ($) day	Jul. 01, 2017 USD ($)	Jun. 30, 2018 USD ($) day	Jul. 01, 2017 USD ($)
Disaggregation of Revenue [Line Items]
Standard terms of payment, number of days | day	10		10
Net sales	$ 892,952	$ 474,001	$ 1,330,439	$ 902,609
Warehouse
Disaggregation of Revenue [Line Items]
Net sales	704,328	353,157	1,037,633	672,588
Direct
Disaggregation of Revenue [Line Items]
Net sales	165,630	97,729	248,572	185,240
Reload and service revenue
Disaggregation of Revenue [Line Items]
Net sales	34,914	31,515	63,184	59,902
Variable consideration
Disaggregation of Revenue [Line Items]
Net sales	(11,920)	(8,400)	(18,950)	(15,121)
Structural products
Disaggregation of Revenue [Line Items]
Net sales	422,464	213,986	628,861	404,699
Specialty products
Disaggregation of Revenue [Line Items]
Net sales	473,410	263,749	704,891	502,868
Other | Other
Disaggregation of Revenue [Line Items]
Net sales	$ (2,922)	$ (3,734)	$ (3,313)	$ (4,958)

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
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-Name Accounting Standards Codification
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