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Debt (Tables)
12 Months Ended
Dec. 31, 2021
Debt Disclosure [Abstract]  
Company's borrowings
The Company’s term debt at December 31 is as follows:
20212020
5.875% Senior Secured Green Notes, due 2028
$550,000 $— 
4.00% Convertible Senior Notes, $59,619 face amount at December 31, 2020, due in June 2036
— 47,057 
REG Ralston term loan, variable interest rate of LIBOR plus 2.25%, due in October 2025
— 13,241 
REG Capital term loan, fixed interest rate of 3.99%, due in January 2028
— 6,665 
Other— 14 
Total debt before debt issuance costs550,000 66,977 
Less: Current portion of long-term debt— 50,088 
Less: Debt issuance costs (net of accumulated amortization of $1,376 and $990, respectively)
13,243 1,731 
Total long-term debt$536,757 $15,158 
Summary of company's revolving borrowings The following table shows the Company's lines of credit:
20212020
Total revolving loans (current)$— $— 
Maximum remaining available to be borrowed under revolving lines of credit$249,666 $149,666