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Fair Value of Financial Instruments (Tables) | 12 Months Ended
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Dec. 31, 2017
Fair Value Disclosures [Abstract] |
Fair Value of Long-Term Debt | The carrying value of our remaining long-term debt reported in the accompanying consolidated balance sheets approximates fair value as substantially all of such debt bears interest based on prevailing variable market rates currently available in the countries in which we have borrowings.
| December 31,
| 2017 |  | 2016
| Recorded Amount |  | Fair Value |  | Recorded Amount |  | Fair Value
| (In thousands)
Long-term debt | $ | 1,845,309 |  |  | $ | 1,949,638 |  |  | $ | 2,381,370 |  |  | $ | 2,472,813 |

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