Other assets

a) Other assets are as follows:



	March 31, 2013		March 31, 2012
Prepaid lease payments (note 8)	$	764	$	895
Intangible assets (note 13(b))	8,625		12,866
Deferred financing costs (note 13(c))	4,973		6,141
	$	14,362	$	19,902

b) Intangible assets



March 31, 2013	Cost		Accumulated Amortization		Net Book Value
Other intangible assets	$	350	$	328	$	22
Internal-use software	21,914		13,311		8,603
	$	22,264	$	13,639	$	8,625



March 31, 2012	Cost		Accumulated Amortization		Net Book Value
Customer relationships and backlog	$	4,442	$	1,445	$	2,997
Other intangible assets	2,364		1,204		1,160
Internal-use software	16,825		9,644		7,181
Patents	2,017		489		1,528
	$	25,648	$	12,782	$	12,866

During the year ended March 31, 2013, the Company capitalized $5,081 (2012 – $3,537; 2011 – $4,748) related to internally developed computer software. There was no internal-use software written down during the year and writedown expense of $nil was included in amortization of intangible assets during the year ended March 31, 2013 (2012 – $249; 2011 – $nil).

Amortization of intangible assets for the year ended March 31, 2013 was $3,694 (2012 – $4,287; 2011 – $2,150). The estimated amortization expense for future years is as follows:



For the year ending March 31,
2014	$	3,430
2015	2,612
2016	1,801
2017	782
2018 and thereafter	—
	$	8,625

c) Deferred financing costs



March 31, 2013	Cost		Accumulated Amortization		Net Book Value
Term and Revolving Facilities	$	5,861	$	5,384	$	477
Series 1 Debentures	6,886		2,390		4,496
	$	12,747	$	7,774	$	4,973



March 31, 2012	Cost		Accumulated Amortization		Net Book Value
Term and Revolving Facilities	$	5,422	$	4,652	$	770
Series 1 Debentures	6,886		1,515		5,371
	$	12,308	$	6,167	$	6,141

During the year ended March 31, 2013, financing fees of $439 were incurred in connection with modifications made to the amended and restated credit agreement (2012 – $60; 2011 – $1,034) (note 16(b)). During the year ended March 31, 2013, financing fees of $nil were incurred in connection with the Series 1 Debentures (2012 – $nil; 2011 - $5,846) (note 16(e)). 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 March 31, 2013 was $1,607 (2012 – $1,591; 2011 – $1,609). Upon redemption of the 8³/₄% senior notes on April 28, 2010, the unamortized deferred financing costs related to the 8³/₄% senior notes of $4,324 were expensed and included in the loss on debt extinguishment (note 16(d)). In addition, $183 related to amortization of deferred financing costs incurred up to the redemption date was included in interest expense for the year ended March 31, 2011.