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FINANCIAL INSTRUMENTS (Tables) | 12 Months Ended
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Dec. 31, 2020
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 significant financial instruments at December 31:
| 2020 |  | 2019
| Carrying Amount |  | Fair Value |  | Carrying Amount |  | Fair Value
| (Dollars in thousands)
Assets: |  |  |  |  |  |  |
Cash and cash equivalents | $ | 409,481 |  |  | $ | 409,481 |  |  | $ | 203,824 |  |  | $ | 203,824 |
Liabilities: |  |  |  |  |  |  |
Bank debt | $ | 930,407 |  |  | $ | 930,407 |  |  | $ | 795,830 |  |  | $ | 795,830 |
4¾% Notes | 300,000 |  |  | 304,890 |  |  | 300,000 |  |  | 308,217 |
3¼% Notes | 795,307 |  |  | 806,283 |  |  | 729,755 |  |  | 748,349 |
4⅛% Notes | 599,089 |  |  | 623,280 |  |  | 400,000 |  |  | 401,848 |
2¼% Notes | 611,775 |  |  | 622,481 |  |  | — |  |  | — |

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=121572278&loc=d3e13467-108611 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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