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Stock-based compensation | 12 Months Ended
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Mar. 31, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Stock-based compensation | Stock-based compensation a) Stock-based compensation expenses Stock-based compensation expenses included in general and administrative expenses are as follows:
Year ended March 31, |  | 2013 |  |  | 2012 |  |  | 2011 |
Share option plan (note 24(b)) |  | $ | 1,333 |  |  | $ | 1,373 |  |  | $ | 1,455 |
Senior executive stock option plan (note 24(c)) |  | — |  |  | (2,878 | ) |  | 2,878 |
Deferred performance share unit plan (note 24(d)) |  | — |  |  | — |  |  | (44 | )
Restricted share unit plan (note 24(e)) |  | 1,275 |  |  | 733 |  |  | 1,603 |
Directors' deferred stock unit plan (note 24(f)) |  | 997 |  |  | (1,747 | ) |  | 1,484 |
Stock award plan (note 24(g)) |  | 14 |  |  | 256 |  |  | 780 |
|  | $ | 3,619 |  |  | $ | (2,263 | ) |  | $ | 8,156 |
b) Share option plan Under the 2004 Amended and Restated Share Option Plan, which was approved and became effective in 2006, directors, officers, employees and certain service providers to the Company are eligible to receive stock options to acquire voting common shares in the Company. Each stock option provides the right to acquire one common share in the Company and expires ten years from the grant date or on termination of employment. Options may be exercised at a price determined at the time the option is awarded, and vest as follows: no options vest on the award date and twenty percent vest on each subsequent anniversary date.
|  | Number of options |  |  | Weighted average exercise price $ per share |
Outstanding at March 31, 2010 |  | 2,250,804 |  |  | 7.84 |
Granted |  | 260,000 |  |  | 9.77 |
Exercised(i) |  | (193,250 | ) |  | 4.98 |
Forfeited |  | (120,080 | ) |  | 10.30 |
Modified(ii) |  | (550,000 | ) |  | 5.00 |
Outstanding at March 31, 2011 |  | 1,647,474 |  |  | 9.25 |
Granted |  | 287,700 |  |  | 6.56 |
Exercised(i) |  | (8,480 | ) |  | 4.15 |
Forfeited |  | (91,900 | ) |  | 10.42 |
Outstanding at March 31, 2012 |  | 1,834,794 |  |  | 8.79 |
Granted |  | 1,517,400 |  |  | 2.83 |
Forfeited |  | (366,472 | ) |  | 9.10 |
Outstanding at March 31, 2013 |  | 2,985,722 |  |  | 5.72 |
(i) | All stock options exercised resulted in new common shares being issued (note 19(a));
(ii) | 550,000 stock options were modified as senior executive stock options on September 22, 2010 (note 24(c)).
Cash received from option exercises for the year ended March 31, 2013 was $nil (2012 - $35; 2011 – $963). The total intrinsic value of options exercised, calculated as market value at the exercise date less exercise price, multiplied by the number of units exercised, for the years ended March 31, 2013, 2012 and 2011 was $nil, $48 and $1,084, respectively. The following table summarizes information about stock options outstanding at March 31, 2013:
|  | Options outstanding |  |  | Options exercisable |
Exercise price |  | Number |  |  | Weighted average remaining life |  | Weighted average exercise price |  |  | Number |  |  | Weighted average remaining life |  |  | Weighted average exercise price |
$2.75 |  | 705,600 |  |  | 9.5 years |  | $ | 2.75 |  |  | — |  |  | — |  |  | — |
$2.79 |  | 750,000 |  |  | 9.2 years |  | $ | 2.79 |  |  | — |  |  | — |  |  | — |
$3.69 |  | 115,840 |  |  | 6.4 years |  | $ | 3.69 |  |  | 91,700 |  |  | 6.6 years |  |  | $ | 3.69 |
$4.90 |  | 40,000 |  |  | 9 years |  | $ | 4.90 |  |  | — |  |  | — |  |  | — |
$5.00 |  | 403,982 |  |  | 1.8 years |  | $ | 5.00 |  |  | 403,982 |  |  | 1.8 years |  |  | $ | 5.00 |
$6.56 |  | 188,260 |  |  | 8.1 years |  | $ | 6.56 |  |  | 42,140 |  |  | 7.4 years |  |  | $ | 6.56 |
$8.28 |  | 80,000 |  |  | 6.2 years |  | $ | 8.28 |  |  | 48,000 |  |  | 6.2 years |  |  | $ | 8.28 |
$8.58 |  | 60,000 |  |  | 7.5 years |  | $ | 8.58 |  |  | 24,000 |  |  | 7.5 years |  |  | $ | 8.58 |
$9.33 |  | 125,560 |  |  | 6.5 years |  | $ | 9.33 |  |  | 79,200 |  |  | 6.6 years |  |  | $ | 9.33 |
$10.13 |  | 128,780 |  |  | 7.4 years |  | $ | 10.13 |  |  | 55,640 |  |  | 7.3 years |  |  | $ | 10.13 |
$13.21 |  | 75,000 |  |  | 4.8 years |  | $ | 13.21 |  |  | 75,000 |  |  | 4.8 years |  |  | $ | 13.21 |
$13.50 |  | 194,940 |  |  | 4.6 years |  | $ | 13.50 |  |  | 194,940 |  |  | 4.6 years |  |  | $ | 13.50 |
$15.37 |  | 40,000 |  |  | 5 years |  | $ | 15.37 |  |  | 40,000 |  |  | 5 years |  |  | $ | 15.37 |
$16.46 |  | 50,000 |  |  | 5 years |  | $ | 16.46 |  |  | 40,000 |  |  | 5 years |  |  | $ | 16.46 |
$16.75 |  | 27,760 |  |  | 3.5 years |  | $ | 16.75 |  |  | 27,760 |  |  | 3.5 years |  |  | $ | 16.75 |
|  | 2,985,722 |  |  | 7.1 years |  | $ | 5.72 |  |  | 1,122,362 |  |  | 4.2 years |  |  | $ | 8.82 |
At March 31, 2013, the weighted average remaining contractual life of outstanding options is 7.1 years (March 31, 2012 – 6.3 years). The fair value of options vested during the year ended March 31, 2013 was $1,381 (March 31, 2012 – $1,652). At March 31, 2013, the Company had 1,122,362 exercisable options (March 31, 2012 – 1,031,774) with a weighted average exercise price of $8.82 (March 31, 2012 – $8.82). At March 31, 2013, the total compensation costs related to non-vested awards not yet recognized was $2,768 (March 31, 2012 – $2,655) and these costs are expected to be recognized over a weighted average period of 3.6 years (March 31, 2012 – 3.2 years). The fair value of each option granted by the Company was estimated on the grant date using the Black-Scholes option pricing model with the following assumptions:
Year ended March 31, |  | 2013 |  |  | 2012 |  |  | 2011 |
Number of options granted |  | 1,517,400 |  |  | 287,700 |  |  | 260,000 |
Weighted average fair value per option granted ($) |  | 1.88 |  |  | 4.38 |  |  | 6.79 |
Weighted average assumptions: |  |  |  |  |  |
Dividend yield |  | Nil | % |  | Nil | % |  | Nil | %
Expected volatility |  | 74.52 | % |  | 75.22 | % |  | 78.59 | %
Risk-free interest rate |  | 1.02 | % |  | 1.32 | % |  | 2.65 | %
Expected life (years) |  | 6.4 |  |  | 6.3 |  |  | 6.1 |
The Company uses company specific historical data to estimate the expected life of the option, such as employee option exercise and employee post-vesting departure behaviour. c) Senior executive stock option plan On September 22, 2010, the Company modified a senior executive employment agreement to allow the option holder the right to settle options in cash which resulted in 550,000 stock options (senior executive stock options) changing classification from equity to a long term liability. The liability is measured at fair value using the Black-Scholes model at the modification date and subsequently at each period end date. Previously recognized compensation cost related to the senior executive stock option plan of $2,237 was transferred from additional paid-in capital to the senior executive stock option liability on the modification date. The fair value of the compensation liability is calculated using the Black-Scholes model at each period end. Changes in fair value of the liability are recognized in the Consolidated Statements of Operations. The weighted average assumptions used in estimating the fair value of the senior executive stock options as at March 31, 2013 are as follows:
Year ended March 31, |  | 2013 |  |  | 2012 |  |  | 2011 |
Number of senior executive stock options |  | 550,000 |  |  | 550,000 |  |  | 550,000 |
Weighted average fair value per option granted ($) |  | 1.68 |  |  | 2.40 |  |  | 9.30 |
Weighted average assumptions: |  |  |  |  |  |
Dividend yield |  | Nil | % |  | Nil | % |  | Nil | %
Expected volatility |  | 71.74 | % |  | 74.99 | % |  | 76.74 | %
Risk-free interest rate |  | 0.26 | % |  | 0.54 | % |  | 1.77 | %
Expected life (years) |  | 2.1 |  |  | 3.1 |  |  | 6.1 |
d) Deferred performance share unit plan The Company has no outstanding Deferred Performance Share Units (“DPSUs”) at this time. DPSUs were granted each fiscal year with respect of services to be provided in that fiscal year and the following two fiscal years. The DPSUs vested at the end of a three-year term and were subject to the performance criteria approved by the Compensation Committee of the Board of Directors at the date of grant. Such performance criterion included the passage of time and the return on invested capital calculated as operating income divided by average operating assets. The maturity date for such DPSUs was the last day of the third fiscal year following the grant date. At the maturity date, the Compensation Committee assessed the participant against the performance criteria and determined the number of DPSUs that were earned (earned DPSUs). The settlement of the participant’s entitlement was made at the Company’s option either in cash, in an amount equivalent to the number of earned DPSUs multiplied by the fair market value of the Company’s common shares as determined by the volume weighted average trading price of the Company’s common shares for the five trading days immediately preceding the date of maturity, or in a number of common shares equal to the number of earned DPSUs. If settled in common shares, the common shares were purchased on the open market or through the issuance of shares from treasury. The fair value of each unit under the DPSU Plan was estimated on the date of the grant using Black-Scholes option pricing model. There were no DPSUs granted in fiscal 2013, 2012 and 2011.
|  | Number of units |
Outstanding at March 31, 2010 |  | 507,295 |
Forfeited |  | (74,776 | )
Outstanding at March 31, 2011 |  | 432,519 |
Expired |  | (41,117 | )
Converted to RSUs (note 24(e)) |  | (391,402 | )
Outstanding at March 31, 2012 and 2013 |  | — |
On April 1, 2011, the Company converted 262,737 and 128,665 Deferred Performance Share Units (“DPSUs”) into Restricted Share Units (“RSUs”) for the April 1, 2009 and March 31, 2010 grants at a conversion factor of 50% and 75% respectively (note 24(e)). e) Restricted share unit plan Restricted Share Units (“RSUs”) are granted each fiscal year with respect to services to be provided in that fiscal year and the following two fiscal years. The RSUs vest at the end of a three-year term. The Company classifies RSUs as a liability as the Company has the ability and intent to settle the awards in cash. Compensation expense is calculated based on the number of vested shares multiplied by the fair market value of each RSU as determined by the volume weighted average trading price of the Company’s common shares for the five trading days immediately preceding the day on which the fair market value is to be determined. The Company recognizes compensation expense over the three-year term of the RSU in the Consolidated Statements of Operations. On April 1, 2011, the Company converted the April 1, 2009 and March 31, 2010 DPSUs (note 24(d)) into RSUs at a conversion factor of 50% and 75% respectively.
|  | Number of units |
Outstanding at March 31, 2010 |  | 468,815 |
Forfeited |  | (86,339 | )
Outstanding at March 31, 2011 |  | 382,476 |
Granted |  | 695,086 |
Settled |  | (27,850 | )
Forfeited |  | (102,022 | )
Converted from DPSUs (note 24(d)) |  | 227,875 |
Outstanding at March 31, 2012 |  | 1,175,565 |
Granted |  | 625,405 |
Settled |  | (345,679 | )
Forfeited |  | (364,446 | )
Outstanding at March 31, 2013 |  | 1,090,845 |
At March 31, 2013, in the Consolidated Balance Sheets the $719 current portion of RSU liabilities were included in accrued liabilities (March 31, 2012 - $2,066) and long term portion of RSU liabilities of $2,049 were included in other long term obligations (March 31, 2012 — $1,104). During the year ended March 31, 2013, 345,679 units were settled in cash for $1,677 (2012 - 27,850 units settled in cash for $318). At March 31, 2013, an additional 154,330 vested, which were settled in April 2013 using a redemption value of $4.66 per unit. This liability is included in the current portion of RSU liabilities at March 31, 2013. At March 31, 2013, the weighted average remaining contractual life of the outstanding RSUs, including the 154,330 fully vested but unsettled units, was 1.4 years (March 31, 2012 – 1.4 years). Using a fair market value of $4.65 per unit at March 31, 2013, there were approximately $2,335 of total unrecognized compensation costs related to non–vested share–based payment arrangements under the RSU Plan (March 31, 2012 – $2,576) and these costs are expected to be recognized over the weighted average remaining contractual life of the RSUs of 1.6 years (March 31, 2012 – 1.4 years). f) Director’s deferred stock unit plan On November 27, 2007, the Company approved a Directors’ Deferred Stock Unit (“DDSU”) Plan, which became effective January 1, 2008. Under the DDSU Plan, non–officer directors of the Company receive 50% of their annual fixed remuneration (which is included in general and administrative expenses) in the form of DDSUs and may elect to receive all or a part of their annual fixed remuneration in excess of 50% in the form of DDSUs. The number of DDSUs to be credited to the participants deferred unit account is determined by dividing the amount of the participant’s deferred remuneration by fair market value of the Company's common shares, calculated as the Canadian Dollar equivalent of the volume weighted average trading price of the Company’s common shares for the five trading days immediately preceding the date that participants’ remuneration becomes payable. The DDSUs vest immediately upon issuance and are only redeemable upon death or retirement of the participant for cash determined by the market price of the Company’s common shares for the five trading days immediately preceding death or retirement. Directors, who are not US taxpayers, may elect to defer the redemption date until a date no later than December 1st of the calendar year following the year in which the retirement or death occurred.
|  | Number of units |
Outstanding at March 31, 2010 |  | 263,266 |
Issued |  | 73,752 |
Outstanding at March 31, 2011 |  | 337,018 |
Issued |  | 128,248 |
Outstanding at March 31, 2012 |  | 465,266 |
Issued |  | 266,091 |
Redeemed |  | (63,413 | )
Outstanding at March 31, 2013 |  | 667,944 |
At March 31, 2013, the fair market value of these units was 4.65 per unit (March 31, 2012 – $4.91 per unit). At March 31, 2013, the current portion of DDSU liabilities of $355 were included in accrued liabilities (March 31, 2012 - $nil) and the long term portion of DDSU liabilities of $2,751 were included in other long term obligations (March 31, 2012 - $2,284) in the Consolidated Balance Sheets. During the year ended March 31, 2013, 63,413 units were redeemed and settled in cash for $175 (March 31, 2012 - no units were redeemed). There is no unrecognized compensation expense related to the DDSUs, since these awards vest immediately when issued. g) Stock award plan On September 24, 2009, the former Chief Executive Officer’s (CEO) employment agreement was extended by the Board of Directors for a further period of two years, to May 8, 2012. In addition to the existing conditions in his employment agreement, as of September 24, 2010, the effective date, the former CEO was granted the right to receive 150,000 common shares of the Company as follows:
• | 50,000 shares on May 8, 2011;
• | 50,000 shares on November 8, 2011; and
• | 50,000 shares on May 8, 2012.
The former CEO’s entitlement, upon the above release dates, could be settled in common shares purchased on the open market or through the issuance of common shares from treasury, in each case net of required withholdings. The estimate of the fair value of the stock award on the grant date is equal to the market price of the Company’s common shares. During the year ended March 31, 2013, 50,000 stock awards vested (March 31, 2012 - 100,000 stock awards) and were settled in common shares purchased on the open market for $148 (March 31, 2012 - $822). At March 31, 2013 there were no stock award plan units outstanding.

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- Definition The entire disclosure for compensation-related costs for equity-based compensation, which may include disclosure of policies, compensation plan details, allocation of equity compensation, incentive distributions, equity-based arrangements to obtain goods and services, deferred compensation arrangements, employee stock ownership plan details and employee stock purchase plan details. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 50 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6406099&loc=d3e25284-112666 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Statement of Position (SOP) -Number 93-6 -Paragraph 53 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 40 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6418621&loc=d3e17540-113929 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph 64, 65, A240 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5444-113901 + Details
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