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Share Capital, Option Plans And Share-Based Payments (Narrative) (Details) (USD $) | 3 Months Ended | 6 Months Ended |  | 3 Months Ended | 6 Months Ended | 0 Months Ended | 3 Months Ended | 6 Months Ended |  | 12 Months Ended |  | 12 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended
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Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2011 | Dec. 31, 2010 | Jun. 30, 2011 | Dec. 31, 2011 Deferred Stock Units [Member] | Dec. 31, 2010 Deferred Stock Units [Member] | Dec. 31, 2011 Deferred Stock Units [Member] | Dec. 31, 2010 Deferred Stock Units [Member] | Jul. 21, 2009 Restricted Stock Units [Member] | Dec. 31, 2011 Employee Share Purchase Plan [Member] | Dec. 31, 2010 Employee Share Purchase Plan [Member] | Dec. 31, 2011 Employee Share Purchase Plan [Member] | Dec. 31, 2010 Employee Share Purchase Plan [Member] | Sep. 30, 2010 LTIP 1 [Member] | Jun. 30, 2009 LTIP 2 [Member] | Sep. 30, 2011 LTIP 2 [Member] | Jun. 30, 2010 LTIP 3 [Member] | Dec. 31, 2010 LTIP 4 [Member] | Dec. 31, 2010 LTIP 4 [Member] | Jun. 30, 2011 LTIP 4 [Member] | Dec. 31, 2011 LTIP 3 And LTIP 4 [Member] | Dec. 31, 2010 LTIP 3 And LTIP 4 [Member] | Dec. 31, 2011 LTIP 3 And LTIP 4 [Member] | Dec. 31, 2010 LTIP 3 And LTIP 4 [Member] | Jun. 30, 2010 Maximum [Member] LTIP 3 [Member] | Jun. 30, 2011 Maximum [Member] LTIP 4 [Member] | Jun. 30, 2010 Minimum [Member] LTIP 3 [Member] | Jun. 30, 2011 Minimum [Member] LTIP 4 [Member]
Share-based Compensation Arrangement By Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase of treasury stock (in shares) |  | 264,834 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase of treasury stock |  | $ 12,500,000 |  | $ 12,499,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common shares reissued |  |  |  |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of options outstanding | 1,837,552 |  | 1,837,552 |  | 2,277,733 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common shares were available for issuance | 1,207,795 |  | 1,207,795 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vesting period of stock options (in years) |  |  | four |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum period (in years) for expiry of stock option |  |  | seven |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum period (in years) for expiry of stock option |  |  | ten |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unrecognized compensation cost relating to unvested stock awards | 5,700,000 |  | 5,700,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unvested stock awards compensation cost, weighted average recognition period (years) |  |  | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Awards settled in cash in the aggregate amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 14,400,000 |  | 10,700,000 |  |  |  |  |  |  |  |  |  |  |  |
Cash received from employee stock purchase plan |  |  |  |  |  |  |  |  |  |  | 400,000 | 300,000 | 1,000,000 | 600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash proceeds from exercise of options granted | 3,000,000 | 1,000,000 | 10,200,000 | 3,900,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tax benefit realized from exercise of options | 400,000 | 200,000 | 800,000 | 1,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based payment awards granted |  |  |  |  |  | 6,760 | 4,721 | 7,023 | 4,878 | 574,767 |  |  |  |  |  |  |  |  | 264,834 | 264,834 |  |  |  |  |  |  |  |  |
Share-based payment awards granted, value |  |  |  |  |  |  |  |  |  | $ 13.33 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
LTIP equity plans, estimated award grant percentage against target |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100.00% |  | 100.00% |  |  | 100.00% |  |  |  |  | 150.00% | 150.00% | 50.00% | 50.00%
Compensation cost expensed during the period-LTIP equity plans |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,400,000 | $ 1,900,000 | $ 6,300,000 | $ 3,400,000 |  |  |  |

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- Definition Equity-based compensation cost during the period with respect to the award, which will be recognized in income (as well as the total recognized tax benefit) or capitalized as part of the cost of an asset. + References Reference 1: 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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph 64, 65 -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 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph g(1) -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 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 + Details
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph b(2)(c) -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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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