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Financial Instruments (Tables) | 12 Months Ended
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Dec. 31, 2017
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:
| 2017 |  | 2016
| Carrying Amount |  | Fair Value |  | Carrying Amount |  | Fair Value
| (Dollars in thousands)
Assets: |  |  |  |  |  |  |
Cash and cash equivalents | $ | 53,533 |  |  | $ | 53,533 |  |  | $ | 24,690 |  |  | $ | 24,690 |
Derivative instruments (other current assets) | 1,150 |  |  | 1,150 |  |  | 1,094 |  |  | 1,094 |
Liabilities: |  |  |  |  |  |  |
Bank debt | $ | 903,945 |  |  | $ | 903,945 |  |  | $ | 771,192 |  |  | $ | 771,192 |
5% Notes | 280,000 |  |  | 281,691 |  |  | 500,000 |  |  | 510,130 |
5½% Notes | 300,000 |  |  | 308,301 |  |  | 300,000 |  |  | 312,750 |
4¾% Notes | 300,000 |  |  | 309,390 |  |  | — |  |  | — |
3¼% Notes | 780,325 |  |  | 813,793 |  |  | — |  |  | — |
Derivative instruments (accrued liabilities) | 115 |  |  | 115 |  |  | 244 |  |  | 244 |

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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=77997519&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=66048111&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=77997519&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=75026489&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=75031198&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=77997519&loc=d3e13433-108611 + Details
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