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Other current assets (Narrative) (Details) |  | 12 Months Ended |
--- | --- | --- | ---
Aug. 13, 2021 USD ($) item | Aug. 13, 2021 CAD ($) item | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 21, 2021 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Period to settle advances against auction contracts |  |  | 14 days |  |  |
Proceeds on disposition of assets |  |  | $ 1,911,000 | $ 16,385,000 | $ 5,929,000 |
Selling price | $ 170,000,000 | $ 210,000,000 |  |  |  |
Selling costs | $ 1,500,000 |  |  |  |  |
Lease term | 2 years |  |  |  |  |
Option to renew lease | true | true |  |  |  |
Prepaid interest |  |  |  |  |  | $ 11,150,000
Number of renewals | item | 2 | 2 |  |  |  |
Renewal term | 1 year |  |  |  |  |
Assets held for sale | $ 7,067,000 |  | 17,538,000 |  | 15,051,000 |
Arizona, United States [Member] |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Assets held for sale |  |  | $ 10,500,000 |  |  |
United States [Member] |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Proceeds on disposition of assets |  |  |  | 15,555,000 |  |
Gain on sale of assets |  |  |  | $ 1,090,000 | $ 571,000 |

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