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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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Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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