Other assets

a) Other assets are as follows:



	December 31, 2018		December 31, 2017
Long term prepaid lease payments	$	1,853	$	1,779
Other long term receivable	619		—
Intangible assets (note 10(b))	2,916		938
Deferred financing costs (note 10(c))	1,178		707
Deferred lease inducement asset (note 10(d))	641		784
Loan to DNSS Partnership (note 13(b))	689		969
Contract costs (note 19(f))	2,308		422
	$	10,204	$	5,599

b) Intangible assets



December 31, 2018	Cost		Accumulated amortization		Net book value
Internal-use software	$	11,925	$	11,019	$	906
Other intangible assets	2,010		—		2,010
	$	13,935	$	11,019	$	2,916



December 31, 2017	Cost		Accumulated amortization		Net book value
Internal-use software	$	18,188	$	17,250	$	938

During the year ended December 31, 2018, fully amortized internal-use software with a cost of $6,643 was disposed. Amortization of intangible assets for the year ended December 31, 2018 was $412 (2017 – $918). The estimated amortization expense for future years is as follows:



For the year ending December 31,
2019	$	734
2020	664
2021	470
2022	439
2023 and thereafter	609
	$	2,916

c) Deferred financing costs



	December 31, 2018		December 31, 2017
Cost	$	1,575	$	821
Accumulated amortization	397		114
	$	1,178	$	707

During the year ended December 31, 2018, financing fees of $754 (2017 - $840) were incurred in connection with the revolving facilities under the credit facilities (note 14(b)). These fees are being amortized ratably over the term of the credit facilities.

Amortization of these deferred financing costs included in interest expense for the year ended December 31, 2018 was $283 (2017 – $453) (note 21).

d) Deferred lease inducements asset



	December 31, 2018			December 31, 2017
Balance, beginning of year	$	784		$	927
Amortization	(143		)	(143		)
Balance, end of year	$	641		$	784

Lease inducements applicable to lease contracts are deferred and amortized as an increase in 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.