Other assets

a) Other assets are as follows:



	December 31, 2013		December 31, 2012
Prepaid lease payments (note 8)	$	1,274	$	97
Intangible assets (note 12(b))	7,043		12,063
Deferred financing costs (note 12(c))	3,813		5,350
	$	12,130	$	17,510

b) Intangible assets



December 31, 2013	Cost		Accumulated Amortization		Net Book Value
Other intangible assets	$	350	$	350	$	—
Internal-use software	22,713		15,670		7,043
	$	23,063	$	16,020	$	7,043



December 31, 2012	Cost		Accumulated Amortization		Net Book Value
Customer relationships and backlog	$	4,442	$	1,960	$	2,482
Other intangible assets	2,364		1,523		841
Internal-use software	19,887		12,425		7,462
Patents	2,017		739		1,278
	$	28,710	$	16,647	$	12,063

During the year ended December 31, 2013, the Company capitalized $2,826 (2012 – $4,305) related to internally developed computer software.

Amortization of intangible assets for the year ended December 31, 2013 was $3,276 (2012 – $3,686). The estimated amortization expense for future years is as follows:



For the year ending December 31,
2014	$	3,003
2015	2,198
2016	1,255
2017	587
	$	7,043

c) Deferred financing costs



December 31, 2013	Cost		Accumulated Amortization		Net Book Value
Revolving Facilities	$	6,881	$	5,994	$	887
Series 1 Debentures	8,655		5,729		2,926
	$	15,536	$	11,723	$	3,813



December 31, 2012	Cost		Accumulated Amortization		Net Book Value
Term and Revolving Facilities	$	5,861	$	5,233	$	628
Series 1 Debentures	6,886		2,164		4,722
	$	12,747	$	7,397	$	5,350

During the year ended December 31, 2013, financing fees of $1,020 were incurred in connection with modifications made to the amended and restated credit agreement (2012 – $439) (note 15(b)). During the year ended December 31, 2013, financing fees of $1,769 were incurred in connection with the Series 1 Debentures (2012 – $nil) (note 15(d)). These fees have been recorded as deferred financing costs and are being amortized using the effective interest method over the term of the credit agreement and the Series 1 Debentures, respectively.

Amortization of deferred financing costs included in interest expense for the year ended December 31, 2013 was $4,326 (2012 – $1,623). Upon the partial redemption of the Series 1 Debentures on July 22, 2013, a portion of the unamortized deferred financing costs related to the redeemed Series 1 Debentures of $2,737 were expensed and included in amortization of deferred financing costs (note 15(d)).