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Long-Term Debt - Schedule of Long-term Debt (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020 | Sep. 30, 2020
--- | --- | --- | ---
Debt Instrument [Line Items] |  |  |
Total debt - principal | $ 4,147,799 | $ 3,271,969 | $ 3,469,408
Less unamortized debt issuance costs and debt discount | 21,972 | 20,716 | 21,638
Debt long term and short term less unamortized debt issuance costs and debt discount | 4,125,827 | 3,251,253 | 3,447,770
Less current portion | 934,246 | 28,036 | 284,465
Long-term debt | 3,191,581 | 3,223,217 | 3,163,305
Bank debt |  |  |
Debt Instrument [Line Items] |  |  |
Total debt - principal | 1,346,003 | 930,407 | 1,185,825
Finance Leases |  |  |
Debt Instrument [Line Items] |  |  |
Total debt - principal | 69,061 | 34,480 | 35,035
Bank Revolving Loans | Bank debt |  |  |
Debt Instrument [Line Items] |  |  |
Total debt - principal | 910,000 | 0 | 246,000
Less current portion | 910,000 |  |
U S Term Loans | Bank debt |  |  |
Debt Instrument [Line Items] |  |  |
Total debt - principal | 400,000 | 900,000 | 900,000
Other Foreign Bank Revolving and Term Loans | Bank debt |  |  |
Debt Instrument [Line Items] |  |  |
Total debt - principal | 36,003 | 30,407 | 39,825
Less current portion | 21,600 |  |
Senior Notes | 4¾% Notes |  |  |
Debt Instrument [Line Items] |  |  |
Total debt - principal | 300,000 | 300,000 | 300,000
Senior Notes | 3¼% Notes |  |  |
Debt Instrument [Line Items] |  |  |
Total debt - principal | 753,285 | 795,307 | 762,223
Senior Notes | 4⅛% Notes |  |  |
Debt Instrument [Line Items] |  |  |
Total debt - principal | 600,000 | 600,000 | 600,000
Senior Notes | 2¼% Notes |  |  |
Debt Instrument [Line Items] |  |  |
Total debt - principal | 579,450 | 611,775 | 586,325
Senior Notes | 1.4% Notes |  |  |
Debt Instrument [Line Items] |  |  |
Total debt - principal | 500,000 | $ 0 | $ 0
Finance Leases |  |  |
Debt Instrument [Line Items] |  |  |
Less current portion | $ 2,600 |  |

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