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Long-Term Debt (Tables) | 3 Months Ended
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Mar. 31, 2019
Debt Disclosure [Abstract] |
Long-term Debt | Long-term debt at March 31, 2019 and December 31, 2018 consisted of the following (in thousands):
| March 31, |  | December 31,
| 2019 |  | 2018
1.875% Senior notes, net of unamortized discount and debt issuance costs of $2,576 at March 31, 2019 and $2,841 at December 31, 2018 | $ | 440,098 |  |  | $ | 444,155 |
4.15% Senior notes, net of unamortized discount and debt issuance costs of $2,762 at March 31, 2019 and $2,884 at December 31, 2018 | 422,238 |  |  | 422,116 |
4.50% Senior notes, net of unamortized discount and debt issuance costs of $514 at March 31, 2019 and $589 at December 31, 2018 | 174,701 |  |  | 174,626 |
5.45% Senior notes, net of unamortized discount and debt issuance costs of $3,966 at March 31, 2019 and $4,004 at December 31, 2018 | 346,034 |  |  | 345,996 |
Commercial paper notes | 425,000 |  |  | 306,606 |
Variable-rate foreign bank loans | 7,232 |  |  | 7,216 |
Finance lease obligations | 4,285 |  |  | 4,495 |
Total long-term debt | 1,819,588 |  |  | 1,705,210 |
Less amounts due within one year | 425,684 |  |  | 307,294 |
Long-term debt, less current portion | $ | 1,393,904 |  |  | $ | 1,397,916 |

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