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Long-term debt (Tables)
12 Months Ended
Dec. 31, 2020
Debt Disclosure [Abstract]  
Schedule of long-term debt
Long-term debt consists of the following at year-end:
 20202019
2027 Notes$553,354 $265,000 
2023 Notes216,593 348,069 
Finance lease obligations5,941 5,419 
Other long-term borrowings10,199 13,284 
Subtotal786,087 631,772 
Discount on 2023 Notes(1,147)(2,504)
Discount on 2027 Notes(7,358)— 
Premium on 2023 Notes427 937 
Premium on 2027 Notes3,206 — 
Deferred financing costs(4,641)(3,397)
Total776,574 626,808 
Current portion of long-term debt3,129 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 Currency20202019Maturity
2027 Notes5.875 %USD$553,354 $265,000 April 4, 2027
2023 Notes6.625 %USD216,593 348,069 September 27, 2023


Interest Expense (i)DFC Amortization (i)

Amortization of Premium/Discount, net (i)
202020192018202020192018202020192018
2027 Notes$20,269 $15,569 $15,569 $402 $299 $299 $133 $— $— 
2023 Notes20,882 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:
 PrincipalInterestTotal
2021$3,129 $47,999 $51,128 
20224,126 47,796 51,922 
2023219,204 47,527 266,731 
20242,204 32,949 35,153 
2025553 32,832 33,385 
Thereafter556,871 50,632 607,503 
Total payments786,087 259,735 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 Notes427 — 427 
Premium on 2027 Notes3,206 — 3,206 
Deferred financing cost(4,641)— (4,641)
Long-term debt$776,574 $ $776,574