Energy Assets, Net - Energy Assets (Details) - USD ($) $ in Thousands  | 
Jun. 30, 2021  | 
Dec. 31, 2020  | 
||
|---|---|---|---|---|
| Property, Plant and Equipment [Line Items] | ||||
| Energy assets, net | [1] | $ 798,609 | $ 729,378 | |
| Energy Assets | ||||
| Property, Plant and Equipment [Line Items] | ||||
| Energy assets | 1,044,288 | 954,426 | ||
| Less - accumulated depreciation and amortization | (245,679) | (225,048) | ||
| Energy assets, net | $ 798,609 | $ 729,378 | ||
  | ||||
| X | ||||||||||
- 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. No definition available. 
  | 
| X | ||||||||||
- Definition Amount before accumulated depreciation, depletion and amortization of other physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef 
  | 
| X | ||||||||||
- Definition Amount of accumulated depreciation of long-lived, physical assets used to produce goods and services and not intended for resale, classified as other. No definition available. 
  | 
| X | ||||||||||
- Definition Amount after depreciation of long-lived, physical assets used to produce goods and services and not intended for resale, classified as other. No definition available. 
  | 
| X | ||||||||||
- Details 
  |