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Long-Term Debt - Schedule of Long-term Debt (Details) - USD ($) $ in Thousands | Jun. 30, 2021 | Dec. 31, 2020 | Jun. 30, 2020
--- | --- | --- | ---
Debt Instrument [Line Items] |  |  |
Total debt - principal | $ 3,440,236 | $ 3,271,969 | $ 3,520,556
Less unamortized debt issuance costs and debt discount | 22,984 | 20,716 | 22,713
Debt long term and short term less unamortized debt issuance costs combined amount | 3,417,252 | 3,251,253 | 3,497,843
Less current portion | 240,859 | 28,036 | 391,418
Long-term debt | 3,176,393 | 3,223,217 | 3,106,425
Bank debt |  |  |
Debt Instrument [Line Items] |  |  |
Total debt - principal | 642,991 | 930,407 | 1,296,534
Finance Leases |  |  |
Debt Instrument [Line Items] |  |  |
Total debt - principal | 33,460 | 34,480 | 35,102
Bank Revolving Loans | Bank debt |  |  |
Debt Instrument [Line Items] |  |  |
Total debt - principal | 195,859 | 0 | 354,000
Less current portion | 195,900 |  |
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 | 47,132 | 30,407 | 42,534
Less current portion | 43,100 |  |
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 | 770,835 | 795,307 | 728,520
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 | 592,950 | 611,775 | 560,400
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 | $ 1,900 |  |

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