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Long-Term Debt (Details) - USD ($) $ in Thousands | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Debt Instrument [Line Items] |  |
Total long-term Debt | $ 2,044,417 | $ 3,572,058
Unamortized discount and debt issuance costs | (15,062) | (20,332)
Current portion of long-term debt | 623 | 804,677
Long-term debt | $ 2,043,794 | 2,767,381
1.875% Senior Notes |  |
Debt Instrument [Line Items] |  |
Debt instrument, interest rate | 1.875% |
Unsecured debt | 1.125% Notes |  |
Debt Instrument [Line Items] |  |
Total long-term Debt | $ 450,103 | $ 610,800
Debt instrument, interest rate | 1.125% | 1.125%
Unsecured debt | 1.625% Notes |  |
Debt Instrument [Line Items] |  |
Total long-term Debt | $ 596,750 | $ 610,800
Debt instrument, interest rate | 1.625% | 1.625%
Unsecured debt | Floating Rate Notes |  |
Debt Instrument [Line Items] |  |
Total long-term Debt | $ 0 | $ 200,000
Senior notes | 1.875% Senior Notes |  |
Debt Instrument [Line Items] |  |
Total long-term Debt | $ 0 | $ 480,007
Debt instrument, interest rate | 1.875% | 1.875%
Senior notes | 3.45% Senior Notes |  |
Debt Instrument [Line Items] |  |
Total long-term Debt | $ 171,612 | $ 300,000
Debt instrument, interest rate | 3.45% | 3.45%
Senior notes | 4.15% Senior Notes |  |
Debt Instrument [Line Items] |  |
Total long-term Debt | $ 425,000 | $ 425,000
Debt instrument, interest rate | 4.15% | 4.15%
Senior notes | 5.45% Senior Notes |  |
Debt Instrument [Line Items] |  |
Total long-term Debt | $ 350,000 | $ 350,000
Debt instrument, interest rate | 5.45% | 5.45%
Credit facilities |  |
Debt Instrument [Line Items] |  |
Total long-term Debt | $ 0 | $ 223,900
Commercial paper notes |  |
Debt Instrument [Line Items] |  |
Total long-term Debt | 0 | 325,000
Variable-rate foreign bank loans |  |
Debt Instrument [Line Items] |  |
Total long-term Debt | 7,222 | 7,702
Finance lease obligations |  |
Debt Instrument [Line Items] |  |
Total long-term Debt | $ 58,792 | $ 59,181

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