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.

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- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt, classified as current. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Amount after unamortized (discount) premium and debt issuance costs of long-term debt classified as noncurrent and excluding amounts to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Outstanding Loans and Security Agreements - Schedule of Debt (Details) - USD ($)	Dec. 31, 2020	Aug. 31, 2020	May 01, 2020	Mar. 31, 2020	Mar. 30, 2020	Dec. 31, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Unpaid Principal Balance	$ 527,054,000					$ 658,083,000
Current portion of debt	120,846,000					337,583,000
Long-term portion of debt	270,053,000					299,229,000
Total	390,899,000					636,812,000
Unused Borrowing Capacity	968,000					1,220,000
10.25% Senior Secured Notes due March 2027
Debt Instrument [Line Items]
Interest rate percentage			10.25%
Letter of Credit due December 2021, Non-Recourse
Debt Instrument [Line Items]
Unpaid Principal Balance						0
Current portion of debt						0
Long-term portion of debt						0
Total						0
Letters of Credit \| Letter of Credit due December 2021, Non-Recourse
Debt Instrument [Line Items]
Unused Borrowing Capacity	$ 968,000					$ 1,220,000
Interest rate percentage	2.25%					2.25%
Term loan \| Term Loan due November 2020, Recourse
Debt Instrument [Line Items]
Unpaid Principal Balance	$ 0					$ 1,571,000
Current portion of debt						1,536,000
Long-term portion of debt						0
Total						$ 1,536,000
Interest rate percentage	4.00%					4.00%
Term loan \| Term Loan due September 2028, Non-Recourse
Debt Instrument [Line Items]
Unpaid Principal Balance	$ 34,456,000					$ 38,337,000
Current portion of debt	2,826,000					3,882,000
Long-term portion of debt	28,920,000					31,087,000
Total	$ 31,746,000					$ 34,969,000
Interest rate percentage	7.50%					7.50%
Term loan \| Term Loan due December 2021, Non-Recourse
Debt Instrument [Line Items]
Unpaid Principal Balance	$ 114,761,000					$ 121,784,000
Current portion of debt	114,138,000					5,122,000
Long-term portion of debt	0					115,315,000
Total	$ 114,138,000					$ 120,437,000
Interest rate percentage	2.50%					2.50%
Convertible promissory notes \| 10% Convertible Promissory Notes due December 2021
Debt Instrument [Line Items]
Interest rate percentage	10.00%			10.00%		10.00%	10.00%
Convertible promissory notes \| Convertible Promissory Notes Interest Rate 5% Due December 2020, Recourse
Debt Instrument [Line Items]
Unpaid Principal Balance						$ 33,104,000
Current portion of debt						36,482,000
Long-term portion of debt						0
Total						$ 36,482,000
Interest rate percentage	5.00%				5.00%	5.00%
Convertible promissory notes \| Convertible Promissory Notes Interest Rate 6% Due December 2020, Recourse
Debt Instrument [Line Items]
Unpaid Principal Balance						$ 289,299,000
Current portion of debt						273,410,000
Long-term portion of debt						0
Total						$ 273,410,000
Interest rate percentage	10.00%					6.00%
Notes \| 10% Senior Secured notes due July 2024
Debt Instrument [Line Items]
Unpaid Principal Balance						$ 93,000,000
Current portion of debt	$ 79,000,000.0					14,000,000
Long-term portion of debt						75,962,000
Total						$ 89,962,000
Interest rate percentage	10.00%					10.00%
Notes \| 10.25% Senior Secured Notes due March 2027
Debt Instrument [Line Items]
Unpaid Principal Balance	$ 70,000,000.0
Current portion of debt	0
Long-term portion of debt	68,614,000
Total	$ 68,614,000
Interest rate percentage	10.25%					10.25%
Senior secured notes \| 2.5% Green Convertible Senior Notes due August 2025
Debt Instrument [Line Items]
Unpaid Principal Balance	$ 230,000,000	$ 230,000,000.0
Current portion of debt	0
Long-term portion of debt	99,394,000
Total	$ 99,394,000
Interest rate percentage	2.50%	2.50%				2.50%
Senior secured notes \| Senior Secured Notes due March 2030, Non-Recourse
Debt Instrument [Line Items]
Unpaid Principal Balance	$ 77,837,000					$ 80,988,000
Current portion of debt	3,882,000					3,151,000
Long-term portion of debt	73,125,000					76,865,000
Total	$ 77,007,000					$ 80,016,000
Interest rate percentage	6.07%					6.07%
Recourse debt
Debt Instrument [Line Items]
Unpaid Principal Balance	$ 300,000,000					$ 416,974,000
Current portion of debt	0					325,428,000
Long-term portion of debt	168,008,000					75,962,000
Total	168,008,000					401,390,000
Letters of Credit \| Letter of Credit due December 2021, Non-Recourse
Debt Instrument [Line Items]
Unpaid Principal Balance	0
Current portion of debt	0
Long-term portion of debt	0
Total	0
Non-recourse debt
Debt Instrument [Line Items]
Unpaid Principal Balance	227,054,000					241,109,000
Current portion of debt	120,846,000					12,155,000
Long-term portion of debt	102,045,000					223,267,000
Total	222,891,000					235,422,000
Unused Borrowing Capacity	$ 968,000					$ 1,220,000