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Borrowing Arrangements (Tables) | 6 Months Ended
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Jun. 30, 2013
Debt Disclosure [Abstract] |
Summary of Carrying Amount of Debt and Equity Components | The carrying amount of the debt and equity components at June 30, 2013 and December 31, 2012 were as follows (in thousands):
|  | June 30, |  |  | December 31, |
|  | 2013 |  |  | 2012 |
Principal amount of notes |  | $ | 130,000 |  |  | $ | 130,000 |
Unamortized discount |  |  | (6,940 | ) |  |  | (8,334 | )
Net carrying amount |  | $ | 123,060 |  |  | $ | 121,666 |
Additional paid-in-capital, net of tax |  | $ | 8,555 |  |  | $ | 8,555 |
The carrying amount of the debt and equity components at June 30, 2013 and December 31, 2012 were as follow (in thousands):
|  | June 30, |  |  | December 31, |
|  | 2013 |  |  | 2012 |
Principal amount of notes |  | $ | 750 |  |  | $ | 750 |
Unamortized discount |  |  | — |  |  |  | — |
Net carrying amount |  | $ | 750 |  |  | $ | 750 |
Additional paid-in-capital, net of tax |  | $ | 11,425 |  |  | $ | 11,425 |
Summary of Recognized Interest Expense on 2010 Notes and 2006 Notes | During the three and six months ended June 30, 2013 and 2012, CBIZ recognized interest expense on the 2010 Notes and 2006 Notes as follows (in thousands):
|  | Three Months Ended June 30, |  |  | Six Months Ended June 30, |
|  | 2013 |  |  | 2012 |  |  | 2013 |  |  | 2012 |
Contractual coupon interest |  | $ | 1,590 |  |  | $ | 1,591 |  |  | $ | 3,181 |  |  | $ | 3,181 |
Amortization of discount |  |  | 710 |  |  |  | 659 |  |  |  | 1,394 |  |  |  | 1,295 |
Amortization of deferred financing costs |  |  | 180 |  |  |  | 180 |  |  |  | 360 |  |  |  | 360 |
Total interest expense |  | $ | 2,480 |  |  | $ | 2,430 |  |  | $ | 4,935 |  |  | $ | 4,836 |
Summary of Unsecured Credit Facility | June 30, 2013 and December 31, 2012, respectively. Rates for the six months ended June 30, 2013 and 2012 were as follows:
|  | Six Months Ended June 30,
|  | 2013 |  | 2012
Weighted average rates |  | 2.96% |  | 3.22%
Range of effective rates |  | 2.66% - 3.91% |  | 2.69% - 3.91%

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- Definition Tabular disclosure of short-term or long-term contractual arrangements with lenders, including letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(e),(f)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph f -Article 4 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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