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Debt and Financing Lease Liabilities - Summary of Long-term Debt (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Debt Instrument [Line Items] |  |  |
Financing lease liabilities |  | $ 21,352 | $ 23,500
Total debt and financing lease liabilities |  | 416,217 | 391,761
Less: current maturities |  | 74,901 | 69,362
Less: unamortized discount and debt issuance costs |  | 15,981 | 10,725
Long-term debt and financing lease liabilities, net of current portion, unamortized discount and debt issuance costs | [1] | 325,335 | 311,674
Term Loan | Senior secured term loan |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt, gross |  | 54,031 | 57,688
Term Loan | Non-recourse term loans |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt, gross |  | 229,971 | 198,124
Term Loan | Long-term financing facilities |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt, gross |  | 54,685 | 32,618
Line of Credit | Non-recourse construction revolvers |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt, gross |  | 41,178 | 26,758
Revolving Senior Secured Credit Facility |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt, gross |  | 15,000 | $ 53,073
Revolving Credit Facility | Line of Credit |  |  |
Debt Instrument [Line Items] |  |  |
Funds available for borrowing |  | $ 151,176 |
[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 Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=123466204&loc=SL6031897-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 + Details
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