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Financial Instruments (Tables) | 12 Months Ended
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Dec. 31, 2014
Fair Value Disclosures [Abstract] |
Summary of Carrying Amounts and Estimated Fair Values of Other Financial Instruments | The following table summarizes the carrying amounts and estimated fair values of our other financial instruments at December 31:
| 2014 |  | 2013
| Carrying Amount |  | Fair Value |  | Carrying Amount |  | Fair Value
| (Dollars in thousands)
Assets: |  |  |  |  |  |  |
Cash and cash equivalents | $ | 222,591 |  |  | $ | 222,591 |  |  | $ | 160,463 |  |  | $ | 160,463 |
Liabilities: |  |  |  |  |  |  |
Bank debt | $ | 798,963 |  |  | $ | 798,963 |  |  | $ | 903,836 |  |  | $ | 903,836 |
5½% Notes | 300,000 |  |  | 307,500 |  |  | 300,000 |  |  | 298,125 |
5% Notes | 500,000 |  |  | 500,715 |  |  | 500,000 |  |  | 495,625 |
Interest rate swap agreements | 1,196 |  |  | 1,196 |  |  | 6,895 |  |  | 6,895 |
Natural gas swap agreements | 746 |  |  | 746 |  |  | 22 |  |  | 22 |

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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=36462937&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=35750535&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=35750535&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=35750535&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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