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Long-Term Debt - Construction and Term Loans (Details) | 1 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Feb. 28, 2018 USD ($) | Dec. 31, 2018 USD ($) Financial_institutions | Oct. 31, 2018 USD ($) | Aug. 31, 2018 USD ($) | Jun. 30, 2018 USD ($) | Dec. 31, 2017 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term debt value, carrying value |  | $ 253,873,000 |  |  |  | $ 202,168,000
Number of project financing debt facilities Company was not in compliance with | Financial_institutions |  | 2 |  |  |  |
Number of project financing debt facilities Company was not in compliance with that waived failure | Financial_institutions |  | 1 |  |  |  |
Number of project financing debt facilities Company was not in compliance with that did not waive failure | Financial_institutions |  | 1 |  |  |  |
Covenant failure fee on a project financing facility |  | $ 3,978,000 |  |  |  |
Term loan | Variable rate term loan payable in quarterly installments |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term debt value, carrying value |  | $ 21,475,000 |  |  |  | 0
Debt interest rate |  | 10.297% |  |  |  |
Term loan | Seven Point Five Percent Term Loan Due In August 2022 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Draws on line of credit | $ 28,500,000 |  |  |  |  |
Term loan | Five Point One Five Percent Term Loan Due December 2038 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term debt value, carrying value |  | $ 30,069,000 |  |  |  | 0
Debt interest rate |  | 5.15% |  |  |  |
Stated interest rate |  |  |  | 5.15% |  |
Original principal amount |  |  |  | $ 31,659,000 | $ 12,407,000 |
Term loan | Variable Rate Term Loan Due In June 2033 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term debt value, carrying value |  | $ 9,668,000 |  |  |  | 0
Debt interest rate |  | 4.847% |  |  |  |
Original principal amount |  |  |  |  | $ 10,000,000 |
Term loan | Variable Rate Term Loan Due In September 2029 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term debt value, carrying value |  | $ 9,072,000 |  |  |  | $ 0
Debt interest rate |  | 5.02% | 2.50% |  |  |
Original principal amount |  |  | $ 9,200 |  |  |
Term Loan - Joinder Agreement | Five Point One Five Percent Term Loan Due December 2038 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Original principal amount |  |  |  | $ 19,252,000 |  |
London Interbank Offered Rate (LIBOR) | Term loan | Seven Point Five Percent Term Loan Due In August 2022 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Basis spread on variable rate | 7.50% |  |  |  |  |

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