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Loans Payable - Long-term Narrative (Details) $ in Thousands |  | 12 Months Ended |  |
--- | --- | --- | --- | ---
Jan. 23, 2019 USD ($) | Jan. 23, 2019 CAD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Mar. 08, 2019 USD ($) | Mar. 08, 2019 CAD ($) | Jan. 23, 2019 CAD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Repayments of construction loans payable |  |  | $ 0 | $ 15,971 | $ 0 |  |  |
Construction Loans | Construction Loan Agreement |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Repayments of construction loans payable | $ 15,971 | $ 21,311,000 |  |  |  |  |  |
Repayments of construction loans payable, accrued interest and fees | 206 | $ 275,000 |  |  |  |  |  |
Non-revolving Term Loan Facility | Credit Facility |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Maximum borrowing capacity | $ 48,715 |  |  |  |  |  |  | $ 65,000,000
Payments of transaction costs |  |  |  |  |  | $ 395 | $ 523,000 |

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