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Fair Value (Tables)
 9 Months Ended
Sep. 30, 2021
Fair Value Disclosures [Abstract]  
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis
The tables below set forth, by level, our financial assets that are accounted for at fair value for the respective periods. The table does not include assets and liabilities that are measured at historical cost or any basis other than fair value (in thousands):
 Fair Value Measured at Reporting Date Using
September 30, 2021Level 1Level 2Level 3Total
Assets
Cash equivalents:
Money market funds$28,071 $— $— $28,071 
$28,071 $— $— $28,071 
Liabilities
Contingent consideration$— $— $3,623 $3,623 
Derivatives:
Embedded EPP derivatives— — 7,186 7,186 
Interest rate swap agreements— 11,853 — 11,853 
$— $11,853 $10,809 $22,662 

 Fair Value Measured at Reporting Date Using
December 31, 2020Level 1Level 2Level 3Total
Assets
Cash equivalents:
Money market funds$235,902 $— $— $235,902 
$235,902 $— $— $235,902 
Liabilities
Derivatives:
Natural gas fixed price forward contracts$— $— $2,574 $2,574 
Embedded EPP derivatives— — 5,541 5,541 
Interest rate swap agreements— 15,989 — 15,989 
$— $15,989 $8,115 $24,104 
Change in Level 3 Financial Liabilities
The changes in the Level 3 financial liabilities during the nine months ended September 30, 2021 were as follows (in thousands):
Natural
Gas
Fixed Price
Forward
Contracts		Embedded EPP Derivative LiabilityTotal
Liabilities at December 31, 2019$6,968 $6,176 $13,144 
Settlement of natural gas fixed price forward contracts(4,503)— (4,503)
Changes in fair value109 (635)(526)
Liabilities at December 31, 20202,574 5,541 8,115 
Changes in fair value— 1,645 1,645 
Transfer from Level 3 to Level 2 in fair value hierarchy(2,574)— (2,574)
Liabilities at September 30, 2021
$— $7,186 $7,186 
Schedule of Fair Values and Carrying Values of Customer Receivables and Debt Instruments The following table presents the estimated fair values and carrying values of customer receivables and debt instruments (in thousands):
 September 30, 2021December 31, 2020
 Net Carrying
Value		Fair ValueNet Carrying
Value		Fair Value
   
 Customer receivables
Customer financing receivables$46,674 $39,545 $50,746 $42,679 
Debt instruments
Recourse:
10.25% Senior Secured Notes due March 2027
68,879 73,345 68,614 71,831 
2.5% Green Convertible Senior Notes due August 2025
222,371 317,078 99,394 426,229 
Non-recourse:
7.5% Term Loan due September 2028
29,699 36,370 31,746 37,658 
6.07% Senior Secured Notes due March 2030
74,289 84,961 77,007 89,654 
LIBOR + 2.5% Term Loan due December 2021
108,958 109,513 114,138 116,113