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Supplemental cash flow information (Tables) | 9 Months Ended
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Sep. 30, 2021
Supplemental cash flow information |
Schedule of Net Changes in Operating Assets and Liabilities | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Nine months ended September 30, | ​ | 2021 | ​ | 2020 | ​
Trade and other receivables |  | $ | (120,160) |  | $ | (185,899) | ​
Inventory | ​ | ​ | 16,926 | ​ | ​ | 3,938 | ​
Advances against auction contracts | ​ | ​ | 3,132 | ​ | ​ | 6,566 | ​
Prepaid expenses and deposits | ​ | ​ | 1,671 | ​ | ​ | 2,184 | ​
Income taxes receivable | ​ | ​ | (4,923) | ​ | ​ | 1,191 | ​
Auction proceeds payable | ​ | ​ | 217,423 | ​ | ​ | 213,596 | ​
Trade and other payables | ​ | ​ | (13,684) | ​ | ​ | 20,675 | ​
Income taxes payable | ​ | ​ | (12,278) | ​ | ​ | 4,179 | ​
Operating lease obligation | ​ | ​ | (9,000) | ​ | ​ | (8,809) | ​
Other | ​ | ​ | 831 | ​ | ​ | (3,709) | ​
Net changes in operating assets and liabilities |  | $ | 79,938 |  | $ | 53,912 | ​
Schedule of Supplemental Cash Flow | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Nine months ended September 30, | ​ | 2021 | ​ | 2020 | ​
Interest paid, net of interest capitalized |  | $ | 31,054 |  | $ | 31,173 | ​
Interest received | ​ | ​ | 1,010 | ​ | ​ | 1,775 | ​
Net income taxes paid | ​ | ​ | 56,016 | ​ | ​ | 32,750 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Non-cash purchase of property, plant and equipment under finance lease |  | ​ | 6,173 |  | ​ | 8,431 | ​
Non-cash right of use assets obtained (reassessed) in exchange for new lease obligations |  | ​ | 13,545 |  | ​ | 595 | ​
Schedule of Cash, Cash Equivalents and Restricted Cash | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | September 30, | ​ | December 31, | ​
​ | ​ | 2021 | ​ | 2020 | ​
Cash and cash equivalents |  | $ | 362,612 | ​ | $ | 278,766 | ​
Restricted cash | ​ | ​ | 105,742 | ​ | ​ | 28,129 | ​
Cash, cash equivalents, and restricted cash |  | $ | 468,354 | ​ | $ | 306,895 | ​

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