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Share Capital (Details) (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Performance Based Awards [Member] |  |  |
Number Outstanding, Begining balance | 1,380,557 | 501,923 | 557,958
Number Outstanding, Granted | 753,896 | 1,097,754 | 753,209
Number Outstanding, Vested | (1,747,987) | (217,697) | (804,300)
Number Outstanding, Forfeited | (29,946) | (1,423) | (4,944)
Number Outstanding, Ending balance | 356,520 | 1,380,557 | 501,923
Weighted Average Grant Date Fair Value, Begining balance | $ 15.81 | $ 8.83 | $ 8.17
Weighted Average Grant Date Fair Value, Granted | $ 13.05 | $ 18.39 | $ 8.83
Weighted Average Grant Date Fair Value, Vested | $ 14.44 | $ 12.74 | $ 8.37
Weighted Average Grant Date Fair Value, Forfeited | $ 15.66 | $ 14.59 | $ 8.88
Weighted Average Grant Date Fair Value, Ending balance | $ 16.09 | $ 15.81 | $ 8.83
Time Based Awards [Member] |  |  |
Number Outstanding, Begining balance | 584,899 | 616,067 | 924,160
Number Outstanding, Granted | 250,237 | 297,520 | 258,223
Number Outstanding, Vested | (263,458) | (287,234) | (562,971)
Number Outstanding, Forfeited | (14,720) | (41,454) | (3,345)
Number Outstanding, Ending balance | 556,958 | 584,899 | 616,067
Weighted Average Grant Date Fair Value, Begining balance | $ 12.86 | $ 7.40 | $ 7.33
Weighted Average Grant Date Fair Value, Granted | $ 11.67 | $ 16.93 | $ 10.28
Weighted Average Grant Date Fair Value, Vested | $ 12.25 | $ 5.17 | $ 8.60
Weighted Average Grant Date Fair Value, Forfeited | $ 14.82 | $ 8.79 | $ 8.13
Weighted Average Grant Date Fair Value, Ending balance | $ 12.72 | $ 12.86 | $ 7.40

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- Definition The weighted average of equity-based payment instruments other than stock options which were forfeited during the reporting period. + References No definition available. + Details
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- Definition The weighted average fair value of awards on equity-based plans excluding stock options (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) as of the balance sheet date. + References No definition available. + Details
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- Definition The weighted average of equity-based payment instruments other than stock options which vested during the reporting period. + References No definition available. + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + 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 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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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued 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 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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- Definition The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period. + References Reference 1: 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)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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