| Schedule of Balances of Variable Interest Entities |
| | | | | | | | | | | June 30, 2018 | | December 31,
2017 | Assets | | | | Current assets: | | | | Cash and cash equivalents | $ | 31,395 |
| | $ | 33,273 |
| Restricted cash | 4,336 |
| | 4,314 |
| Trade receivables | 12,759 |
| | 12,769 |
| Prepaid expenses | 7,050 |
| | 4,965 |
| Other current assets | 1,513 |
| | 2,597 |
| Deferred financing costs, net | 135 |
| 150 |
| 150 |
| Total current assets | 57,188 |
| | 58,068 |
| | | | | Restricted cash | 614 |
| | 3,330 |
| Property, plant and equipment, net | 1,935,581 |
| | 1,984,606 |
| Deferred financing costs, net | 1,489 |
| | 1,549 |
| Finite-lived intangible assets, net | 11,903 |
| | 12,210 |
| Other assets | 12,830 |
| | 12,984 |
| Total assets | $ | 2,019,605 |
| | $ | 2,072,747 |
| | | | | Liabilities | | | | Current liabilities: | | | | Accounts payable and other accrued liabilities | $ | 17,001 |
| | 26,826 |
| Accrued construction costs | 13 |
| | 759 |
| Accrued interest | 127 |
| | 78 |
| Other current liabilities | 3,867 |
| | 4,789 |
| Total current liabilities | 21,008 |
| | 32,452 |
| | | | | Finite-lived intangible liability, net | 49,460 |
| | 51,194 |
| Contingent liabilities | — |
| | 87 |
| Other long-term liabilities | 56,345 |
| | 47,345 |
| Total liabilities | $ | 126,813 |
| | $ | 131,078 |
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