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Other long term obligations | 12 Months Ended
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Dec. 31, 2020
Other Liabilities Disclosure [Abstract] |
Other long-term obligations | Other long-term obligations
| Note |  | December 31, 2020 |  | December 31, 2019
Directors' deferred stock unit plan | 17(c) |  | $ | 10,761 |  |  | $ | 14,375 |
Deferred gain on sale-leaseback | 13(a) |  | 4,748 |  |  | 6,593 |
Other |  |  | 3,341 |  |  | 3,536 |
|  |  | $ | 18,850 |  |  | $ | 24,504 |
a) Deferred gain on sale-leaseback Changes in deferred gains on sale-leaseback transactions of heavy equipment are summarized below.
|  | December 31, 2020 |  | December 31, 2019
Balance, beginning of year |  | $ | 6,593 |  |  | $ | 8,438 |
Amortization of deferred gain on sale-leaseback |  | (1,845) |  |  | (1,845) |
Balance, end of year |  | $ | 4,748 |  |  | $ | 6,593 |
The gain on sale was deferred and is being amortized in the Consolidated Statements of Operations and Comprehensive Income over the expected useful life of the equipment.

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- Definition The entire disclosure for other liabilities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.20,24) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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