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Fair Values of Financial Instruments (Tables) | 9 Months Ended
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Sep. 30, 2013
Estimated Fair Value of Outstanding Debt Balances | The estimated fair value of the Company’s outstanding debt balances (including current portion) as of September 30, 2013 and December 31, 2012 is set forth below (in thousands):
|  | September 30, 2013 |  |  | December 31, 2012 |
|  | Carrying Value |  |  | Fair Value |  |  | Carrying Value |  |  | Fair Value |
Borrowings under credit agreement: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Term loan facility |  | $ | 95,000 |  |  | $ | 95,000 |  |  | $ | 98,750 |  |  | $ | 98,750 |
4.97% Series A Senior Notes |  |  | 300,000 |  |  |  | 305,591 |  |  |  | 300,000 |  |  |  | 329,281 |
4.27% Series B Senior Notes |  |  | 300,000 |  |  |  | 286,483 |  |  |  | 300,000 |  |  |  | 310,591 |
Total debt |  | $ | 695,000 |  |  | $ | 687,074 |  |  | $ | 698,750 |  |  | $ | 738,622 |

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- Definition Tabular disclosure of the fair value of financial instruments, including financial assets and financial liabilities, and the measurements of those instruments, assets, and liabilities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=28364263&loc=d3e13433-108611 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=28364263&loc=d3e13467-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=28364263&loc=d3e13476-108611 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 30 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6957238&loc=d3e14172-108612 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6447952&loc=d3e13220-108610 + Details
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