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9. Debt (Tables)
6 Months Ended
Jun. 30, 2021
Debt Instruments [Abstract]  
Schedule of Long-term Debt Instruments
Our long-term debt consisted of the following at June 30, 2021 and December 31, 2020 (in thousands):
Balance (USD)
Loan AgreementCurrencyJune 30,
2021
December 31,
2020
Revolving Credit FacilityUSD$— $— 
Luz del Norte Credit FacilitiesUSD184,546 186,230 
Japan Credit FacilityJPY34,184 13,813 
Tochigi Credit FacilityJPY— 39,400 
Kyoto Credit FacilityJPY44,462 47,706 
Ikeda Credit FacilityJPY24,945 — 
Long-term debt principal288,137 287,149 
Less: unamortized discounts and issuance costs(8,814)(7,918)
Total long-term debt279,323 279,231 
Less: current portion(3,239)(41,540)
Noncurrent portion$276,084 $237,691 
Schedule of Borrowing Rate on Debt Our long-term debt borrowing rates as of June 30, 2021 were as follows:
Loan AgreementJune 30, 2021
Luz del Norte Credit Facilities (1)Fixed rate loans at bank rate plus 3.50%
Variable rate loans at 91-Day U.S. Treasury Bill Yield or LIBOR plus 3.50%
Japan Credit Facility1-month TIBOR plus 0.55%
Kyoto Credit Facility1-month TIBOR plus 0.60%
Ikeda Credit Facility (2)Fixed rate term loan facility at 1.20%
Variable rate term loan facility at 6-month TIBOR plus 0.70% (3)
Consumption tax facility at 3-month TIBOR plus 0.50%
Debt service reserve facility at 6-month TIBOR plus 1.20%
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(1)Outstanding balance comprised of $138.4 million of fixed rate loans and $46.1 million of variable rate loans as of June 30, 2021.

(2)Outstanding balance comprised of $12.3 million of fixed rate loans and $12.7 million of variable rate loans as of June 30, 2021.

(3)We have entered into an interest rate swap contract to hedge a portion of this variable rate. See Note 6. “Derivative Financial Instruments” to our condensed consolidated financial statements for additional information.
Schedule of Maturities of Long-term Debt
At June 30, 2021, the future principal payments on our long-term debt were due as follows (in thousands):
Total Debt
Remainder of 2021$717 
202238,219 
20236,692 
202455,583 
20258,646 
20269,125 
Thereafter169,155 
Total long-term debt future principal payments$288,137