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Fair Values of Financial Instruments (Tables) | 6 Months Ended
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Jun. 30, 2015
Fair Value Disclosures [Abstract] |
Estimated Fair Value of Outstanding Debt Balances | The estimated fair value of the Company’s outstanding debt balances (including current portion) as of June 30, 2015 and December 31, 2014 is set forth below (in thousands):
| June 30, 2015 |  |  | December 31, 2014 |
| Carrying |  |  | Fair |  |  | Carrying |  |  | Fair |
| Value |  |  | Value |  |  | Value |  |  | Value |
Borrowings under Credit Agreement: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revolving credit facility | $ | — |  |  | $ | — |  |  | $ | 303,000 |  |  | $ | 303,000 |
Term loan facility |  | 77,500 |  |  |  | 77,500 |  |  |  | 82,500 |  |  |  | 82,500 |
2015 Term Loan |  | 195,000 |  |  |  | 195,000 |  |  |  | — |  |  |  | — |
4.97% Series A Senior Notes |  | 300,000 |  |  |  | 310,660 |  |  |  | 300,000 |  |  |  | 288,346 |
4.27% Series B Senior Notes |  | 300,000 |  |  |  | 294,629 |  |  |  | 300,000 |  |  |  | 269,173 |
Total debt | $ | 872,500 |  |  | $ | 877,789 |  |  | $ | 985,500 |  |  | $ | 943,019 |

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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 825 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=49121117&loc=d3e13476-108611 Reference 2: 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=36462937&loc=d3e19207-110258 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=49121117&loc=d3e13467-108611 Reference 4: 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 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 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=49121117&loc=d3e13433-108611 + Details
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