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Summary of Significant Accounting Policies (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2016 USD ($) employee Integer6	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Mar. 31, 2017 USD ($)
Trade Accounts Receivables and Allowance for Doubtful Accounts
Trade receivables, allowances	$ 1,459	$ 1,734
Vendor and Customer Rebates and Allowances
Vendor rebates and allowances	7,000	7,700
Customer rebates payable	31,600	27,700
Asset Retirement Obligation
Asset retirement obligations	1,000	200
Deferred Software Costs
Capitalized Computer Software, Net	6,500	6,500
Amortization of deferred software costs	$ 2,100	1,600	$ 1,300
Labor Concentration and Unions
Number of employees \| employee	6,210
Number of collective bargaining arrangements \| Integer6	9
Self Insurance
Self insurance liabilities, current	$ 8,400	9,700
Self insurance liabilities, long-term	$ 10,000	9,800
Scenario, Forecast [Member] \| Retained Earnings [Member] \| ASU 2016-09 [Member]
New Accounting Pronouncements and Changes in Accounting Principles [Abstract]
New Accounting Pronouncement, Cumulative Effect of Change on Equity				$ 200
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	$ 350,000	300,000
Level 2 [Member]
Financial Instruments
Fixed-rate debt	347,400	309,000
Money Market Funds [Member] \| Fair Value, Measurements, Recurring [Member] \| Level 1 [Member]
Financial Instruments
Cash equivalents, fair value	$ 78,100	$ 170,200
Sales Revenue, Net [Member] \| Customer Concentration Risk [Member] \| Top Ten Customers [Member]
Risks and Uncertainties
Concentration risk	33.00%
Accounts Receivable [Member] \| Credit Concentration Risk [Member] \| Customer One [Member]
Risks and Uncertainties
Concentration risk	11.00%
Accounts Receivable [Member] \| Credit Concentration Risk [Member] \| Customer Two [Member]
Risks and Uncertainties
Concentration risk	12.00%
Accounts Receivable [Member] \| Credit Concentration Risk [Member] \| Top Two Customers [Member]
Risks and Uncertainties
Concentration risk		10.00%
Workforce Subject to Collective Bargaining Arrangements [Member] \| Unionized Employees Concentration Risk [Member]
Risks and Uncertainties
Concentration risk	24.00%
Workforce in OR and WA Subject to Collective Bargaining Agreements [Member] \| Unionized Employees Concentration Risk [Member]
Labor Concentration and Unions
Number of employees \| employee	658
Number of collective bargaining arrangements expiring in one year or less \| Integer6	4
Workforce in Billings and Vancouver Subject to Collective Bargaining Arrangements [Member] \| Unionized Employees Concentration Risk [Member]
Labor Concentration and Unions
Number of employees \| employee	47
Number of collective bargaining arrangements expiring in one year or less \| Integer6	2
Workforce in LA subject to Collective Bargaining Agreements [Member] \| Unionized Employees Concentration Risk [Member]
Labor Concentration and Unions
Number of employees \| employee	712
Workforce in Canada subject to Collective Bargaining Agreements [Member] \| Unionized Employees Concentration Risk [Member]
Labor Concentration and Unions
Number of employees \| employee	87
Building Materials Distribution [Member]
Revenue Recognition
Shipping and handling costs	$ 121,600	$ 109,200	$ 104,800