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Other long term obligations | 12 Months Ended
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Dec. 31, 2018
Other Liabilities Disclosure [Abstract] |
Other long term obligations | Other long term obligations a) Other long term obligations are as follows:
|  | December 31, 2018 |  |  | December 31, 2017 |
Deferred lease inducements liability (note 17(b)) |  | $ | 1,419 |  |  | $ | 10 |
Asset retirement obligation (note 17(c)) |  | 818 |  |  | 744 |
Directors' deferred stock unit plan (note 22(e)) |  | 13,413 |  |  | 5,672 |
Deferred gain on sale-leaseback (note 17(d)) |  | 8,438 |  |  | 7,654 |
Provision for loss on sublease (note 17(e)) |  | 1,535 |  |  | — |
|  | $ | 25,623 |  |  | $ | 14,080 |
b) Deferred lease inducements liability Lease inducements applicable to lease contracts are deferred and amortized as a reduction of general and administrative expenses on a straight-line basis over the lease term, which includes the initial lease term and renewal periods only where renewal is determined to be reasonably assured.
|  | December 31, 2018 |  |  | December 31, 2017 |
Balance, beginning of year |  | $ | 10 |  |  | $ | 38 |
Addition |  | 1,412 |  |  | — |
Amortization of deferred lease inducements |  | (3 | ) |  | (28 | )
Balance, end of year |  | $ | 1,419 |  |  | $ | 10 |
c) Asset retirement obligation The Company recorded an asset retirement obligation related to the future retirement of a facility on leased land. Accretion expense associated with this obligation is included in equipment costs in the Consolidated Statements of Operations. The following table presents a continuity of the liability for the asset retirement obligation:
|  | December 31, 2018 |  |  | December 31, 2017 |
Balance, beginning of year |  | $ | 744 |  |  | $ | 678 |
Accretion expense |  | 74 |  |  | 66 |
Balance, end of year |  | $ | 818 |  |  | $ | 744 |
At December 31, 2018, estimated undiscounted cash flows required to settle the obligation were $1,084 (December 31, 2017 – $1,084). The credit adjusted risk-free rate assumed in measuring the asset retirement obligation was 9.42%. The Company expects to settle this obligation in 2021. d) Deferred gain on sale-leaseback At December 31, 2018, the Company recorded a gain of $2,262 (December 31, 2017 – $5,155) on the sale-leaseback of certain heavy equipment. The gain on sale has been deferred and is being amortized in the Consolidated Statements of Operations over the expected useful life of the equipment.
|  | December 31, 2018 |  |  | December 31, 2017 |
Balance, beginning of year |  | $ | 7,654 |  |  | $ | 3,199 |
Addition |  | 2,262 |  |  | 5,155 |
Amortization of deferred gain on sale-leaseback |  | (1,478 | ) |  | (700 | )
Balance, end of year |  | $ | 8,438 |  |  | $ | 7,654 |
e) Provision for loss on sublease In 2018, the Company recorded a provision for the loss on the sub-lease of an under-utilized office facility. The provision is being amortized within general and administrative expenses in the Consolidated Statements of Operations over the remaining term of the lease. The following table presents a continuity of the provision for the loss on sublease:
|  | December 31, 2018 |  |  | December 31, 2017 |
Balance, beginning of year |  | $ | — |  |  | $ | — |
Addition |  | 1,732 |  |  | — |
Amortization of loss |  | (197 | ) |  | — |
Balance, end of year |  | $ | 1,535 |  |  | $ | — |

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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=6877327&loc=d3e13212-122682 + Details
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