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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 |

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