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Financial Instruments (Tables) | 6 Months Ended
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Jun. 30, 2017
Investments, All Other Investments [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 June 30, 2017:
| Carrying Amount |  | Fair Value
| (Dollars in thousands)
Assets: |  |  |
Cash and cash equivalents | $ | 142,083 |  |  | $ | 142,083 |
Natural gas swap agreements | 103 |  |  | 103 |
Liabilities: |  |  |  |  |
Bank debt | $ | 1,489,971 |  |  | $ | 1,489,971 |
5% Senior Notes | 280,000 |  |  | 283,903 |
5½% Senior Notes | 300,000 |  |  | 309,558 |
4¾% Senior Notes | 300,000 |  |  | 307,533 |
3¼% Senior Notes | 742,105 |  |  | 762,238 |

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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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