Leases - Supplemental Balance Sheet Information Related to Leases (Details) - USD ($) $ in Thousands |
Jun. 30, 2020 |
Dec. 31, 2019 |
Jan. 01, 2019 |
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| Operating Leases: | |||||||
| Operating lease assets | $ 35,829 | [1] | $ 32,791 | [1] | $ 31,639 | ||
| Current operating lease liabilities | 5,216 | [1] | 5,802 | [1] | 5,084 | ||
| Long-term portions of operating lease liabilities | 32,698 | [1] | 29,101 | [1] | 28,480 | ||
| Total operating lease liabilities | $ 37,914 | $ 34,903 | $ 33,564 | ||||
| Operating lease, weighted-average remaining lease term (in years) | 12 years | 11 years | 10 years | ||||
| Operating lease, weighted-average discount rate (as a percent) | 6.10% | 6.30% | 6.00% | ||||
| Financing Leases: | |||||||
| Energy assets, net | $ 35,070 | $ 36,134 | $ 38,263 | ||||
| Current portions of financing lease liabilities | 4,800 | 4,997 | 4,956 | ||||
| Long-term financing lease liabilities, less current portions and net of deferred financing fees | 21,355 | 23,500 | 28,407 | ||||
| Total financing lease liabilities | $ 26,155 | $ 28,497 | $ 33,363 | ||||
| Financing lease, weighted-average remaining lease term (in years) | 16 years | 17 years | 18 years | ||||
| Financing lease, weighted-average discount rate (as a percent) | 11.90% | 11.80% | 11.70% | ||||
| Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List] | us-gaap:PropertyPlantAndEquipmentOtherNet | us-gaap:PropertyPlantAndEquipmentOtherNet | |||||
| Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List] | us-gaap:LongTermDebtAndCapitalLeaseObligations | us-gaap:LongTermDebtAndCapitalLeaseObligations | |||||
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- Definition Financing Leases [Abstract] No definition available.
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- Definition Operating Leases [Abstract] No definition available.
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- Definition Present value of lessee's discounted obligation for lease payments from finance lease. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Present value of lessee's discounted obligation for lease payments from finance lease, classified as current. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Present value of lessee's discounted obligation for lease payments from finance lease, classified as noncurrent. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Indicates line item in statement of financial position that includes noncurrent finance lease liability. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Amount, after accumulated amortization, of right-of-use asset from finance lease. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Indicates line item in statement of financial position that includes finance lease right-of-use asset. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Weighted average discount rate for finance lease calculated at point in time. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Weighted average remaining lease term for finance lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Present value of lessee's discounted obligation for lease payments from operating lease. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Present value of lessee's discounted obligation for lease payments from operating lease, classified as current. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Present value of lessee's discounted obligation for lease payments from operating lease, classified as noncurrent. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Amount of lessee's right to use underlying asset under operating lease. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Weighted average discount rate for operating lease calculated at point in time. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Weighted average remaining lease term for operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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