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Debt Level 4 Debt (Details) (USD $) | 6 Months Ended | 12 Months Ended | 3 Months Ended | 12 Months Ended |  |  | 12 Months Ended |  |  | 12 Months Ended |  | 12 Months Ended
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Jun. 30, 2013 | Jun. 30, 2012 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2012 Asset-based revolving credit facility [Member] | Dec. 31, 2012 Asset-based revolving credit facility [Member] | Jun. 30, 2013 Asset-based revolving credit facility [Member] | Dec. 31, 2011 Asset-based revolving credit facility [Member] | Dec. 31, 2012 Senior Notes [Member] | Jun. 30, 2013 Senior Notes [Member] | Dec. 31, 2011 Senior Notes [Member] | Dec. 31, 2012 7.125% senior subordinated notes | Dec. 31, 2011 7.125% senior subordinated notes | Dec. 31, 2012 Cash [Member] 7.125% senior subordinated notes | Dec. 31, 2012 Senior Notes [Member] 7.125% senior subordinated notes
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Asset-based revolving credit facility |  |  |  |  |  | $ 25,000,000 | $ 25,000,000 | $ 0 | $ 0 |  |  |  |  |  |  |
Long-term debt (senior notes) |  |  |  |  |  |  |  |  |  | 250,000,000 | 250,000,000 | 0 | 0 | 219,560,000 |  |
Long-term debt | 250,000,000 |  | 275,000,000 | 219,560,000 |  |  |  |  |  |  |  |  |  |  |  |
7.125% senior subordinated notes, face amount |  |  |  |  |  |  |  |  |  |  |  |  | 400,000,000 |  |  |
Interest rate |  |  |  |  |  |  |  |  |  | 6.375% | 6.375% |  | 7.125% |  |  |
Repayment of senior subordinated notes | 80,000,000 | 0 | 244,560,000 | 0 | 128,451,000 | 25,000,000 |  |  |  |  |  |  | 75,000,000 |  | 25,000,000 | 144,600,000
Proceeds from Revolving Credit Facility |  |  |  |  |  |  | 50,000,000 |  |  |  |  |  |  |  |  |
Interest paid, net | 9,200,000 | 8,400,000 | 18,100,000 | 16,700,000 | 18,600,000 |  |  |  |  |  |  |  | 1,000,000 |  |  |
Proceeds from issuance of 6.375% senior notes | $ 55,000,000 | $ 0 | $ 300,000,000 | $ 0 | $ 45,000,000 |  |  |  |  | $ 250,000,000 |  |  |  |  |  |
Senior notes interest rate, Description |  |  | If we fail to satisfy these obligations, we will pay additional interest up to 0.25% per annum to holders of the Senior Notes for the first 90-day period immediately following such date and an additional 0.25% per annum with respect to each subsequent 90-day period, up to a maximum rate of 1.0% per annum. |  |  |  |  |  |  |  |  |  |  |  |  |

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