Debt (Non-recourse Debt) (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Less: current maturities	$ 75,475	$ 62,899
Non-recourse
Debt Instrument [Line Items]
Long-term debt, gross	151,399	340,569
Less: current maturities	6,438	9,545
Less: unamortized prepaid debt issuance costs	1,555	774
Long-term debt, less current maturities	143,406	330,250
Non-recourse \| Note payable, variable rate (1.85% at December 31, 2020), payable in increasing amounts plus interest, due 2026
Debt Instrument [Line Items]
Long-term debt, gross	$ 70,000	66,094
Interest rate of debt instruments	3.29%
Non-recourse \| Note payable, variable rate (2.89% at December 31, 2020) payable at maturity, due 2024
Debt Instrument [Line Items]
Long-term debt, gross	$ 56,600	0
Interest rate of debt instruments	2.89%
Non-recourse \| Non-recourse financing obligations, 3.89% to 4.94%, payable at maturity, due 2021 through 2026
Debt Instrument [Line Items]
Long-term debt, gross	$ 21,974	28,855
Non-recourse \| Non-recourse financing obligations, 3.89% to 4.94%, payable at maturity, due 2021 through 2026 \| Minimum
Debt Instrument [Line Items]
Interest rate of debt instruments	3.89%
Non-recourse \| Non-recourse financing obligations, 3.89% to 4.94%, payable at maturity, due 2021 through 2026 \| Maximum
Debt Instrument [Line Items]
Interest rate of debt instruments	4.94%
Non-recourse \| Finance lease obligations, due serially to 2023
Debt Instrument [Line Items]
Long-term debt, gross	$ 2,825	655
Non-recourse \| Line of credit, variable rate, paid 2020
Debt Instrument [Line Items]
Long-term debt, gross	0	180,000
Non-recourse \| Industrial revenue bond, variable rate, paid 2020
Debt Instrument [Line Items]
Long-term debt, gross	0	49,500
Non-recourse \| Note payable, variable rate, paid 2020
Debt Instrument [Line Items]
Long-term debt, gross	$ 0	$ 15,465

Long-term Debt and Lease Obligation, Noncurrent

No definition available.

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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
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- Definition

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

+ References

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- Definition

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.

+ References

No definition available.

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- Definition

Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
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- Definition

Amount of long-term debt and lease obligation, classified as current.

+ References

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