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Level 4 Summary of Significant Accounting Policies (Details) (USD $) | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 | Jun. 30, 2012 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Vendor rebates and allowances | $ 4,000,000 |  | $ 4,000,000 |  | $ 4,100,000 | $ 2,800,000 |
Customer rebates payable | 21,200,000 |  | 21,200,000 |  | 19,700,000 | 15,600,000 |
Rental expense | 3,700,000 | 3,600,000 | 7,300,000 | 7,200,000 | 14,300,000 | 14,500,000 | 14,200,000
Money market funds, fair value | 176,800,000 |  | 176,800,000 |  | 10,600,000 | 164,600,000 |
Concentration of credit risk |  |  |  |  | 11.00% | 10.00% |
Accounts Receivable [Member] | Credit Concentration Risk [Member] |  |  |  |  |  |  |
Concentration of credit risk |  |  | 16.00% |  | 14.00% | 14.00% |
6.375% senior notes [Member] |  |  |  |  |  |  |
6.375% senior notes, book value | 250,000,000 |  | 250,000,000 |  | 250,000,000 | 0 |
6.375% senior notes, fair value | $ 253,800,000 |  | $ 253,800,000 |  | $ 251,600,000 |  |

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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash -URI http://asc.fasb.org/extlink&oid=6506951 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 + Details
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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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=28364263&loc=d3e13537-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6404-108592 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=28364263&loc=d3e13531-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6351-108592 + Details
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