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Supplemental cash flow information (Tables) | 12 Months Ended
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Dec. 31, 2020
Supplemental cash flow information |
Schedule of Net Changes in Operating Assets and Liabilities | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Year ended December 31, | ​ | 2020 | ​ | 2019 | ​ | 2018
Trade and other receivables | ​ | $ | 22,079 |  | $ | (8,611) |  | $ | (43,341)
Inventory | ​ | ​ | (18,149) | ​ | ​ | 44,633 | ​ | ​ | (77,292)
Advances against auction contracts | ​ | ​ | 6,705 | ​ | ​ | 2,766 | ​ | ​ | (8,266)
Prepaid expenses and deposits | ​ | ​ | 2,196 | ​ | ​ | (3,403) | ​ | ​ | 646
Income taxes receivable | ​ | ​ | 13 | ​ | ​ | (445) | ​ | ​ | 13,053
Auction proceeds payable | ​ | ​ | (74,114) | ​ | ​ | 69,382 | ​ | ​ | 8,768
Trade and other payables | ​ | ​ | 38,078 | ​ | ​ | (21,296) | ​ | ​ | 39,531
Income taxes payable | ​ | ​ | 9,671 | ​ | ​ | 5,812 | ​ | ​ | 1,954
Share unit liabilities | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 1,070
Operating lease obligation | ​ | ​ | (11,162) | ​ | ​ | (13,404) | ​ | ​ | —
Other | ​ | ​ | (4,451) | ​ | ​ | 1,168 | ​ | ​ | (1,673)
Net changes in operating assets and liabilities | ​ | $ | (29,134) |  | $ | 76,602 |  | $ | (65,550)
Schedule of Supplemental Cash Flow | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Year ended December 31, | ​ | 2020 | ​ | 2019 | ​ | 2018
Interest paid, net of interest capitalized | ​ | $ | 32,521 |  | $ | 37,046 |  | $ | 39,429
Interest received | ​ | ​ | 2,338 | ​ | ​ | 3,802 | ​ | ​ | 2,888
Net income taxes paid | ​ | ​ | 43,398 | ​ | ​ | 26,699 | ​ | ​ | 10,352
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Non-cash purchase of property, plant and equipment under finance lease | ​ | ​ | 11,326 |  | ​ | 15,282 |  | ​ | 8,968
Non-cash right of use assets obtained (reassessed) in exchange for new lease obligations | ​ | ​ | 10,588 |  | ​ | 29,117 |  | ​ | —
Non-cash equity consideration in connection with Rouse acquisition | ​ | ​ | 1,459 | ​ | ​ | — | ​ | ​ | —
Schedule of Cash, Cash Equivalents and Restricted Cash | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 2020 | ​ | 2019 | ​ | 2018
Cash and cash equivalents | ​ | $ | 278,766 | ​ | $ | 359,671 | ​ | $ | 237,744
Restricted cash | ​ | ​ | 28,129 | ​ | ​ | 60,585 | ​ | ​ | 67,823
Cash, cash equivalents, and restricted cash | ​ | $ | 306,895 | ​ | $ | 420,256 | ​ | $ | 305,567

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