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Pension Benefits (Tables) | 12 Months Ended
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Dec. 31, 2011
Pension Benefits [Abstract] |
Changes in the benefit obligation and the fair value of the Benefit Plans assets |
|  | Year Ended |  |  | Year Ended |
|  | December 31, 2011 |  |  | December 31, 2010 |
|  | $ |  |  | $ |
Change in benefit obligation: |  |  |  |  |  |  |  |
Beginning balance |  |  | 120,723 |  |  |  | 114,256 |
Service cost |  |  | 8,829 |  |  |  | 8,345 |
Interest cost |  |  | 5,167 |  |  |  | 5,148 |
Contributions by plan participants |  |  | 739 |  |  |  | 579 |
Actuarial loss |  |  | 9,408 |  |  |  | 730 |
Benefits paid |  |  | (4,395 | ) |  |  | (7,333 | )
Settlements and curtailments |  |  | — |  |  |  | (4,937 | )
Foreign currency exchange rate changes |  |  | (3,299 | ) |  |  | 3,635 |
Other |  |  | — |  |  |  | 300 |
Ending balance |  |  | 137,172 |  |  |  | 120,723 |
Change in fair value of plan assets: |  |  |  |  |  |  |  |
Beginning balance |  |  | 102,085 |  |  |  | 95,495 |
Actual return on plan assets |  |  | 2,931 |  |  |  | 125 |
Contributions by the employer |  |  | 12,061 |  |  |  | 11,649 |
Contributions by plan participants |  |  | 739 |  |  |  | 579 |
Benefits paid |  |  | (4,339 | ) |  |  | (7,259 | )
Settlements and curtailments |  |  | — |  |  |  | (1,314 | )
Foreign currency exchange rate changes |  |  | (2,357 | ) |  |  | 3,110 |
Other |  |  | (422 | ) |  |  | (300 | )
Ending balance |  |  | 110,698 |  |  |  | 102,085 |
Funded status deficiency |  |  | (26,474 | ) |  |  | (18,638 | )
Amounts recognized in the balance sheets: |  |  |  |  |  |  |  |
Other long-term liabilities |  |  | 26,474 |  |  |  | 18,638 |
Accumulated other comprehensive (loss) income: |  |  |  |  |  |  |  |
Net actuarial losses (1) |  |  | (19,929 | ) |  |  | (18,279 | )
| (1) | As at December 31, 2011, the estimated amount that will be amortized from accumulated other comprehensive (loss) income into net periodic benefit cost in 2012 is $(0.2) million.
Pension plans with benefit obligations and accumulated benefit obligations in excess of plan assets |
|  | December 31, 2011 |  |  | December 31, 2010 |
|  | $ |  |  | $ |
Benefit obligation |  |  | 113,460 |  |  |  | 72,180 |
Fair value of plan assets |  |  | 85,432 |  |  |  | 53,421 |
Accumulated benefit obligation |  |  | 35,358 |  |  |  | 62,405 |
Fair value of plan assets |  |  | 31,815 |  |  |  | 39,134 |
Components of net periodic pension cost relating to the Benefit Plans |
|  | Year Ended December 31, 2011 |  |  | Year Ended December 31, 2010 |  |  | Year Ended December 31, 2009 |
|  | $ |  |  | $ |  |  | $ |
Net periodic pension cost: |  |  |  |  |  |  |  |  |  |  |  |
Service cost |  |  | 8,978 |  |  |  | 8,616 |  |  |  | 9,753 |
Interest cost |  |  | 5,250 |  |  |  | 5,091 |  |  |  | 4,548 |
Expected return on plan assets |  |  | (5,805 | ) |  |  | (5,431 | ) |  |  | (4,624 | )
Amortization of net actuarial loss |  |  | 371 |  |  |  | 281 |  |  |  | 1,394 |
Other |  |  | 421 |  |  |  | (3,390 | ) |  |  | 184 |
Net cost |  |  | 9,215 |  |  |  | 5,167 |  |  |  | 11,255 |
Components of other comprehensive (income) loss relating to the Plans |
|  | Year Ended December 31, 2011 |  |  | Year Ended December 31, 2010 |  |  | Year Ended December 31, 2009 |
|  | $ |  |  | $ |  |  | $ |
Other comprehensive (income) loss: |  |  |  |  |  |  |  |  |  |  |  |
Net loss (gain) arising during the period |  |  | 12,052 |  |  |  | 5,711 |  |  |  | (13,524 | )
Amortization of net actuarial (gain) loss |  |  | (319 | ) |  |  | 1,026 |  |  |  | (1,394 | )
Other loss (gain) |  |  | — |  |  |  | 390 |  |  |  | (785 | )
Total loss (income) |  |  | 11,733 |  |  |  | 7,127 |  |  |  | (15,703 | )
Estimated future benefit payments which reflect expected future service to be paid by the Benefit Plans |
|  | Pension Benefit |
|  | Payments |
Year |  | $ |
2012 |  |  | 8,000 |
2013 |  |  | 4,969 |
2014 |  |  | 6,361 |
2015 |  |  | 6,251 |
2016 |  |  | 5,704 |
2017—2021 |  |  | 29,263 |
Total |  |  | 60,548 |
Fair value of the plan assets |
|  | December 31, 2011 |  |  | December 31, 2010 |
|  | $ |  |  | $ |
Pooled Funds (1) |  |  | 82,501 |  |  |  | 74,826 |
Mutual Funds (2) |  |  |  |  |  |  |  |
Equity investments |  |  | 13,852 |  |  |  | 13,073 |
Debt securities |  |  | 3,445 |  |  |  | 3,197 |
Real estate |  |  | 2,092 |  |  |  | 2,327 |
Cash and money market |  |  | 291 |  |  |  | 1,034 |
Other |  |  | 8,517 |  |  |  | 7,628 |
Total |  |  | 110,698 |  |  |  | 102,085 |
| (1) | The Company has no control over the investment mix or strategy of the pooled funds. The pooled funds guarantee a minimum rate of return. If actual investment returns are less than the guarantee minimum rate, then the provider’s statutory reserves are used to top up the shortfall. The pooled funds primarily invest in hold to maturity bonds, real estate and other fixed income investments, which are expected to provide a stable rate of return.
| (2) | The mutual funds primary aim is to provide investors with an exposure to a diversified mix of predominantly growth oriented assets (70%) with moderate to high volatility and some defensive assets (30%).
Schedule of assumptions used |
|  | December 31, 2011 |  |  | December 31, 2010 |
Discount rates |  |  | 3.2 | % |  |  | 4.4 | %
Rate of compensation increase |  |  | 4.4 | % |  |  | 4.6 | %
|  | Year Ended December 31, 2011 |  |  | Year Ended December 31, 2010 |  |  | Year Ended December 31, 2009 |
Discount rates |  |  | 3.2 | % |  |  | 4.4 | % |  |  | 5.0 | %
Rate of compensation increase |  |  | 4.4 | % |  |  | 4.6 | % |  |  | 4.7 | %
Expected long-term rates of return (1) |  |  | 5.0 | % |  |  | 5.7 | % |  |  | 6.0 | %
| (1) | To the extent the expected return on plan assets varies from the actual return, an actuarial gain or loss results. The expected long-term rates of return on plan assets are based on the estimated weighted-average long-term returns of major asset classes. In determining asset class returns, the Company takes into account long-term returns of major asset classes, historical performance of plan assets, as well as the current interest rate environment. The asset class returns are weighted based on the target asset allocations.

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- Definition Pension plans with benefit obligations and accumulated benefit obligations in excess of plan assets. + References No definition available. + Details
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- Definition Schedule of changes in benefit obligation and fair value of plans assets. + References No definition available. + Details
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- Definition Tabular disclosure of the major categories of plan assets of pension plans and/or other employee benefit plans. This information may include, but is not limited to, the target allocation of plan assets, the fair value of each major category of plan assets, and the level within the fair value hierarchy in which the fair value measurements fall. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Topic 715 -SubTopic 20 -Publisher FASB -Number -Article -Subparagraph (d)(5) -Name Accounting Standards Codification -Paragraph 1 -Section 50 -URI http://asc.fasb.org/extlink&oid=6962843&loc=d3e1928-114920 + Details
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- Definition Tabular disclosure of the assumptions used to determine for pension plans and/or other employee benefit plans the benefit obligation and net benefit cost, including assumed discount rates, rate increase in compensation increase, and expected long-term rates of return on plan assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Topic 715 -SubTopic 20 -Publisher FASB -Number -Article -Subparagraph (k) -Name Accounting Standards Codification -Paragraph 1 -Section 50 -URI http://asc.fasb.org/extlink&oid=6962843&loc=d3e1928-114920 + Details
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- Definition Tabular disclosure of the changes in plan assets and benefit obligations recognized in other comprehensive income (loss) during the period. + References No definition available. + Details
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- Definition Tabular disclosure of benefits expected to be paid by pension plans and/or other employee benefit plans in each of the next five fiscal years and in the aggregate for the five fiscal years thereafter. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Topic 715 -SubTopic 20 -Publisher FASB -Number -Article -Subparagraph (f) -Name Accounting Standards Codification -Paragraph 1 -Section 50 -URI http://asc.fasb.org/extlink&oid=6962843&loc=d3e1928-114920 + Details
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- Definition Tabular disclosure of the components of net benefit costs for pension plans and/or other employee benefit plans including service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) recognized due to settlements or curtailments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Topic 715 -SubTopic 20 -Publisher FASB -Number -Article -Subparagraph (h) -Name Accounting Standards Codification -Paragraph 1 -Section 50 -URI http://asc.fasb.org/extlink&oid=6962843&loc=d3e1928-114920 + Details
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