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Summary of Significant Accounting Policies Level 4 Summary of Significant Accounting Policies (Details) (USD $) | 12 Months Ended |  | 12 Months Ended | 6 Months Ended | 12 Months Ended |  | 12 Months Ended |  |  |
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Dec. 31, 2012 Integer employee | Dec. 31, 2011 | Dec. 31, 2010 | Jun. 30, 2013 | Dec. 31, 2012 Customer Concentration Risk [Member] | Jun. 30, 2013 Accounts Receivable [Member] Credit Concentration Risk [Member] | Dec. 31, 2012 Accounts Receivable [Member] Credit Concentration Risk [Member] | Dec. 31, 2011 Accounts Receivable [Member] Credit Concentration Risk [Member] | Dec. 31, 2012 Workforce Subject to Collective Bargaining Arrangements [Member] | Dec. 31, 2012 Number of Collective Bargaining Arrangements Expiring Within One Year [Member] Integer | Dec. 31, 2012 Building Materials Distribution [Member] | Dec. 31, 2011 Building Materials Distribution [Member] | Dec. 31, 2010 Building Materials Distribution [Member] | Jun. 30, 2013 6.375% senior notes | Dec. 31, 2012 6.375% senior notes | Dec. 31, 2011 6.375% senior notes | Dec. 31, 2011 Fair Value Measurement [Domain]
Shipping and handling costs |  |  |  |  |  |  |  |  |  |  | $ 89,300,000 | $ 79,900,000 | $ 77,900,000 |  |  |  |
Trade receivables, allowances | 2,696,000 | 2,142,000 |  | 2,546,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Concentration of risk | 11.00% | 10.00% |  |  | 29.00% | 16.00% | 14.00% | 14.00% | 30.00% |  |  |  |  |  |  |  |
Money market funds, fair value | 10,600,000 | 164,600,000 |  | 176,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |
6.375% senior notes, book value |  |  |  |  |  |  |  |  |  |  |  |  |  | 250,000,000 | 250,000,000 | 0 |
6.375% senior notes, fair value |  |  |  |  |  |  |  |  |  |  |  |  |  | 253,800,000 | 251,600,000 |  |
Vendor rebates and allowances | 4,100,000 | 2,800,000 |  | 4,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Customer rebates payable | 19,700,000 | 15,600,000 |  | 21,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Asset retirement obligations | 300,000 | 200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred software costs | 3,700,000 | 4,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization of deferred software costs | 1,200,000 | 1,000,000 | 800,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of employees | 4,560 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of collective bargaining arrangements | 10 |  |  |  |  |  |  |  |  | 2 |  |  |  |  |  |  |
Description of Employees with bargaining agreements expiring within one year | 356 employees at our facility in Florien, Louisiana, and 273 employees at our facility in Oakdale, Louisiana |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Self insurance liabilities, current | 7,200,000 | 7,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Self insurance liabilities, long-term | 10,000,000 | 9,700,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long lived assets [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-lived assets |  | 2,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 500,000
Impairment charge of long-lived assets |  | $ (2,000,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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