Deferred Charges

12 Months Ended

Mar. 31, 2014

Deferred Charges

Deferred Charges

6. Deferred Charges

	As at March 31,
	2014			2013
Deferred charges—cost, beginning of the year	$	25,377		$	23,566
Additions		11,696			3,248
Write-offs due to extinguishment of debt		(16,995	)		—
Write-offs due to amendment and restatement of revolving credit facility		—			(1,437	)
Deferred charges—cost, end of the year		20,078			25,377
Accumulated amortization, beginning of the year		(10,957	)		(8,384	)
Amortization during the year		(3,354	)		(3,411	)
Write-offs due to extinguishment of debt		8,873			—
Write-offs due to amendment and restatement of revolving credit facility		—			838
Accumulated amortization, end of the year		(5,438	)		(10,957	)
Net book value	$	14,640		$	14,420
Life in years		3 - 5			1 - 5

        The following table presents the amortization recognized as interest expense during each period reported:

Amortization expense by period:
March 31, 2014	$	3,354
March 31, 2013		3,411
March 31, 2012		3,942