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Leases - Supplemental Balance Sheet Information Related to Leases (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
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Operating Leases: |  |  |
Operating lease assets | [1] | $ 40,355 | $ 39,151
Current portions of operating lease liabilities | [1] | 6,258 | 6,106
Long-term portions of operating lease liabilities | [1] | 36,373 | 35,300
Total operating lease liabilities |  | $ 42,631 | $ 41,406
Weighted-average remaining lease term |  | 12 years | 12 years
Weighted-average discount rate |  | 5.74% | 5.94%
Financing Leases: |  |  |
Energy assets |  | $ 32,408 | $ 34,005
Current portions of financing lease liabilities |  | 3,745 | 4,273
Long-term financing lease liabilities, net of current portion, unamortized discount and debt issuance costs |  | 17,607 | 19,227
Total financing lease liabilities |  | $ 21,352 | $ 23,500
Weighted-average remaining lease term |  | 15 years | 16 years
Weighted-average discount rate |  | 12.02% | 11.94%
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List] |  | Energy assets, net | Energy assets, net
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List] |  | Long-term debt and financing lease liabilities, net of current portion, unamortized discount and debt issuance costs | Long-term debt and financing lease liabilities, net of current portion, unamortized discount and debt issuance costs
[1] | Includes restricted assets of consolidated variable interest entities (“VIEs”) at September 30, 2021 and December 31, 2020 of $126,088 and $162,198, respectively. Includes non-recourse liabilities of consolidated VIEs at September 30, 2021 and December 31, 2020 of $31,224 and $33,335, respectively. See Note 12.

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- Definition Present value of lessee's discounted obligation for lease payments from finance lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=123408670&loc=SL77918701-209980 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123391704&loc=SL77918627-209977 + Details
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