Vendor and customer rebates and allowances.

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Represents the number of major customers.

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Accrued customer rebates and allowances as of the balance sheet date.

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Labor concentration and unions

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The number of collective bargaining arrangements the entity is subject to.

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The number of collective bargaining arrangements the entity is subject to that will expire in one year or less.

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Self Insurance

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Rebates and allowances receivable from the vendor as of the balance sheet date.

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Number of persons employed by the Entity

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A valuation allowance for trade and other receivables due to an Entity within one year (or the normal operating cycle, whichever is longer) that are expected to be uncollectible.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.4)
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-Name Accounting Standards Codification
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-SubTopic 10
-Section 50
-Paragraph 4
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The carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 410
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (c)
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Asset Retirement Obligation
-URI http://asc.fasb.org/extlink&oid=6505190

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- Definition

For each income statement presented, the amount charged to expense for amortization of capitalized computer software costs.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 985
-SubTopic 20
-Section 50
-Paragraph 2
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-Subparagraph (b)
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The carrying amount of capitalized computer software costs net of accumulated amortization as of the balance sheet date.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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-Name Accounting Standards Codification
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- Definition

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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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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-SubTopic 10
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-Section 50
-Paragraph 21
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No definition available.

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- Definition

Fair value portion of notes payable.

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Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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Carrying amount of accrued known and estimated losses incurred as of the balance sheet date for which no insurance coverage exists, and for which a claim has been made or is probable of being asserted, typically arising from workmen's compensation-type of incidents and personal injury to nonemployees from accidents on the entity's property that are expected to be paid within one year (or the normal operating cycle, if longer).

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Carrying amount of accrued known and estimated losses incurred as of the balance sheet date for which no insurance coverage exists, and for which a claim has been made or is probable of being asserted, typically arising from workmen's compensation-type of incidents and personal injury to nonemployees from accidents on the entity's property that are expected to be paid after one year (or the normal operating cycle, if longer).

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Cost incurred during the reporting period in transporting goods and services to customers. Includes freight-out costs.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=51655414&loc=d3e18780-107790

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 605
-SubTopic 45
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-URI http://asc.fasb.org/extlink&oid=51667946&loc=d3e61069-111654

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=51575068

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-Section S99
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-Name Accounting Standards Codification
-Glossary Shipping Costs
-URI http://asc.fasb.org/extlink&oid=51575562

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Summary of Significant Accounting Policies (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2015 USD ($) employee Integer6 Number2	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)
Trade Accounts Receivables and Allowance for Doubtful Accounts
Trade receivables, allowances	$ 1,734	$ 2,062
Vendor and Customer Rebates and Allowances
Vendor rebates and allowances	7,700	6,100
Customer rebates payable	27,700	24,700
Asset Retirement Obligation
Asset retirement obligations	200	200
Deferred Software Costs
Capitalized Computer Software, Net	6,500	4,400
Amortization of deferred software costs	$ 1,600	1,300	$ 1,300
Labor Concentration and Unions
Number of employees \| employee	5,830
Number of collective bargaining arrangements \| Integer6	9
Number of collective bargaining arrangements expiring in one year or less \| Integer6	4
Self Insurance
Self insurance liabilities, current	$ 9,700	7,800
Self insurance liabilities, long-term	$ 9,800	10,700
Software and Software Development Costs [Member] \| Minimum [Member]
Deferred Software Costs
Property, Plant and Equipment, Useful Life	3 years
Software and Software Development Costs [Member] \| Maximum [Member]
Deferred Software Costs
Property, Plant and Equipment, Useful Life	5 years
Reported Value Measurement [Member]
Financial Instruments
Fixed-rate debt	$ 300,000	300,000
Level 2 [Member]
Financial Instruments
Fixed-rate debt	309,000	315,000
Fair Value, Measurements, Recurring [Member] \| Level 1 [Member] \| Money Market Funds [Member]
Financial Instruments
Cash equivalents, fair value	$ 170,200	$ 137,600
Sales Revenue, Net [Member] \| Customer Concentration Risk [Member] \| Top Ten Customers [Member]
Risks and Uncertainties
Concentration Risk Number of Customers \| Number2	10
Concentration risk	29.00%
Accounts Receivable [Member] \| Customer Concentration Risk [Member] \| Top Two Customers [Member]
Risks and Uncertainties
Concentration Risk Number of Customers \| Number2	2
Accounts Receivable [Member] \| Credit Concentration Risk [Member] \| Top Two Customers [Member]
Risks and Uncertainties
Concentration risk	10.00%
Accounts Receivable [Member] \| Credit Concentration Risk [Member] \| Single Customer [Member]
Risks and Uncertainties
Concentration risk		11.00%
Workforce Subject to Collective Bargaining Arrangements [Member] \| Unionized Employees Concentration Risk [Member]
Risks and Uncertainties
Concentration risk	26.00%
Workforce Subject to Collective Bargaining Arrangements Expiring within One Year [Member] \| Unionized Employees Concentration Risk [Member]
Risks and Uncertainties
Concentration risk	11.00%
Labor Concentration and Unions
Number of employees \| employee	653
Building Materials Distribution [Member]
Revenue Recognition
Shipping and handling costs	$ 109,200	$ 104,800	$ 94,800