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Long-term debt (Tables) | 12 Months Ended
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Dec. 31, 2020
Debt Disclosure [Abstract] |
Schedule of long-term debt | Long-term debt consists of the following at year-end:
|  | 2020 |  | 2019
2027 Notes |  | $ | 553,354 |  |  | $ | 265,000 |
2023 Notes |  | 216,593 |  |  | 348,069 |
Finance lease obligations |  | 5,941 |  |  | 5,419 |
Other long-term borrowings |  | 10,199 |  |  | 13,284 |
Subtotal |  | 786,087 |  |  | 631,772 |
Discount on 2023 Notes |  | (1,147) |  |  | (2,504) |
Discount on 2027 Notes |  | (7,358) |  |  | — |
Premium on 2023 Notes |  | 427 |  |  | 937 |
Premium on 2027 Notes |  | 3,206 |  |  | — |
Deferred financing costs |  | (4,641) |  |  | (3,397) |
Total |  | 776,574 |  |  | 626,808 |
Current portion of long-term debt |  | 3,129 |  |  | 3,233 |
Long-term debt, excluding current portion |  | $ | 773,445 |  |  | $ | 623,575 |
The following table presents additional information related to the 2027 and 2023 Notes (the "Notes"):
|  |  |  |  | Principal as of December 31, |  |
| Annual interest rate |  | Currency |  | 2020 |  | 2019 |  | Maturity
2027 Notes | 5.875 | % |  | USD |  | $ | 553,354 |  |  | $ | 265,000 |  |  | April 4, 2027
2023 Notes | 6.625 | % |  | USD |  | 216,593 |  |  | 348,069 |  |  | September 27, 2023
|  | Interest Expense (i) |  | DFC Amortization (i) |  | Amortization of Premium/Discount, net (i)
|  | 2020 |  | 2019 |  | 2018 |  | 2020 |  | 2019 |  | 2018 |  | 2020 |  | 2019 |  | 2018
2027 Notes |  | $ | 20,269 |  |  | $ | 15,569 |  |  | $ | 15,569 |  |  | $ | 402 |  |  | $ | 299 |  |  | $ | 299 |  |  | $ | 133 |  |  | $ | — |  |  | $ | — |
2023 Notes |  | 20,882 |  |  | 23,060 |  |  | 23,060 |  |  | 294 |  |  | 323 |  |  | 323 |  |  | 371 |  |  | 402 |  |  | 397 |
(i)These charges are included within "Net interest expense" in the consolidated statements of income.
Schedule of future payments related to long-term debt | At December 31, 2020, future payments related to the Company’s long-term debt are as follows:
|  | Principal |  | Interest |  | Total
2021 |  | $ | 3,129 |  |  | $ | 47,999 |  |  | $ | 51,128 |
2022 |  | 4,126 |  |  | 47,796 |  |  | 51,922 |
2023 |  | 219,204 |  |  | 47,527 |  |  | 266,731 |
2024 |  | 2,204 |  |  | 32,949 |  |  | 35,153 |
2025 |  | 553 |  |  | 32,832 |  |  | 33,385 |
Thereafter |  | 556,871 |  |  | 50,632 |  |  | 607,503 |
Total payments |  | 786,087 |  |  | 259,735 |  |  | 1,045,822 |
Interest |  | — |  |  | (259,735) |  |  | (259,735) |
Discount on 2023 Notes |  | (1,147) |  |  | — |  |  | (1,147) |
Discount on 2027 Notes |  | (7,358) |  |  | — |  |  | (7,358) |
Premium on 2023 Notes |  | 427 |  |  | — |  |  | 427 |
Premium on 2027 Notes |  | 3,206 |  |  | — |  |  | 3,206 |
Deferred financing cost |  | (4,641) |  |  | — |  |  | (4,641) |
Long-term debt |  | $ | 776,574 |  |  | $ | — |  |  | $ | 776,574 |

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