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Share Capital (Details Textual) (USD $) In Thousands, except Share data, unless otherwise specified | 12 Months Ended |  |  |  | 12 Months Ended |  |  | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2012 Stock Incentive Plan 2005 [Member] | Dec. 31, 2011 Stock Incentive Plan 2005 [Member] | Dec. 31, 2010 Stock Incentive Plan 2005 [Member] | Jun. 02, 2009 Stock Incentive Plan 2005 [Member] | May 26, 2005 Stock Incentive Plan 2005 [Member] | Jun. 02, 2009 Stock Incentive Plan 2005 [Member] Additional Authorized On June 2007 and 2009 [Member] | Dec. 31, 2003 Stock Incentive Plan 2003 [Member] | May 30, 2008 Key Partner Incentive Plan 2008 [Member] | Dec. 31, 2011 Stock Incentive Plan 2011 [Member] | Dec. 31, 2012 Stock Appreciation Rights (SARs) [Member] | Dec. 31, 2011 Stock Appreciation Rights (SARs) [Member] | Dec. 31, 2010 Stock Appreciation Rights (SARs) [Member] | Dec. 31, 2012 Restricted Stock And Restricted Stock Units [Member] | Dec. 31, 2011 Restricted Stock And Restricted Stock Units [Member] | Dec. 31, 2010 Restricted Stock And Restricted Stock Units [Member] | Dec. 31, 2012 Equity Value Appreciation Awards [Member] | Dec. 31, 2011 Equity Value Appreciation Awards [Member] | Dec. 31, 2012 Performance Shares [Member] | Dec. 31, 2011 Performance Shares [Member] | Dec. 31, 2010 Performance Shares [Member] | Dec. 31, 2012 Performance Shares [Member] Restricted Stock And Restricted Stock Units [Member] | Dec. 31, 2012 Time Based Awards [Member] | Dec. 31, 2011 Time Based Awards [Member] | Dec. 31, 2010 Time Based Awards [Member] | Dec. 31, 2012 Time Based Awards [Member] Restricted Stock And Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized |  |  |  |  |  |  | 4,500,000 | 2,000,000 | 2,500,000 |  | 600,000 | 2,000,000 |  |  |  |  |  |  |  | 1,413,000 |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures, Total |  |  |  | 200,000 |  |  |  |  |  | 1,890,786 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Additional Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period |  |  |  |  |  |  |  |  |  | 534,960 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number Outstanding, Forfeited |  |  |  | 100,000 |  |  |  |  |  |  |  |  | 0 | 0 | 0 |  |  |  | 90,000 | 45,000 | 29,946 | 1,423 | 4,944 |  | 14,720 | 41,454 | 3,345 |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period |  |  |  |  | 5 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 22,557 | $ 8,269 | $ 14,976 |  |  |  |  |  |  |  |  |  |
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense |  |  |  |  |  |  |  |  |  |  |  |  | 296 | 387 | 180 | 5,242 | 7,280 | 3,431 |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Outstanding, Weighted Average Remaining Contractual Terms |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 year |  |  |  |  | 1 year 9 months 18 days |  |  |  | 1 year 6 months
Restricted Stock And Restricted Unit Awards Fair Value |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10,322 |  |  |  |  |  |  |  |  |  |  |  |
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Share-based Awards Other than Options |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6,186 |  |  | 4,106 |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,067,303 |  |  | 1,777,547 |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value | 133 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award Vested Percentage On Date Of Grant |  |  |  |  |  |  |  |  |  | 20.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award Vested Percentage On Each Anniversary Date |  |  |  |  |  |  |  |  |  | 20.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award Vested Percentage On Each Of First Two Years |  |  |  |  |  |  |  |  |  | 20.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award Vested Options Weighted Average Remaining ContractualTerm | 3 years 9 months 18 days |  |  |  |  |  |  |  |  |  |  |  | 1 year 2 months 12 days |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award Shares To Be Issued On Vested |  |  |  |  |  |  |  |  |  |  |  |  | 2,067,303 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Exercised In Period Value |  |  |  |  |  |  |  |  |  |  |  |  | 301 | 2,289 | 1,147 |  |  |  |  |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Grant Date Fair Value |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 13,240 |  |  |  |  |  |  |  |
Reserved Shares Under Various Conversion Rights Warrants And Employee Share Related Plans |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,516,832 |  |  |  |  |  |  |  |  |
Proceeds from Stock Options Exercised | 28 | 1,086 | 60 | 27 | 1,011 | 60 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value | $ 5 | $ 900 | $ 20 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term | 3 years 9 months 18 days |  |  |  |  |  |  |  |  |  |  |  | 1 year 2 months 12 days |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Intrinsic Value, Amount Per Share |  |  |  |  |  |  |  |  |  |  |  |  | $ 23,361 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Intrinsic Value, Beginning Balance |  |  |  |  |  |  |  |  |  |  |  |  | $ 23,361 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition The reserved shares under various conversion rights warrants and employee share related plans during the period. + References No definition available. + Details
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- Definition The Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Exercised In Period Value during the period. + References No definition available. + Details
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- Definition The share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grant date fair value during the period. + References No definition available. + Details
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- Definition The Share based compensation arrangement by share based payment award Shares to be issued on vested during the period. + References No definition available. + Details
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- Definition The Share based compensation arrangement by share based payment award vested Options Weighted Average Remaining Contractual Term during the reported period. + References No definition available. + Details
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- Definition The amount Share based compensation arrangement by share based payment award vested percentage on date of grant during the period. + References No definition available. + Details
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- Definition The Share based compensation arrangement by share based payment award vested percentage on each of first two years during the period. + References No definition available. + Details
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- Definition Unrecognized cost of unvested share-based awards, other than options, awarded to employees as compensation. + References No definition available. + Details
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- Definition The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the 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 (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The cash inflow associated with the amount received from holders exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (j) -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 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585 + Details
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- Definition Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + 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 (a)(1) -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 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 Per share weighted average intrinsic value of equity-based compensation awards not vested. Excludes stock and unit options. + 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 Weighted average remaining contractual term for equity-based awards excluding options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + 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 (e)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Per share weighted average intrinsic value of equity-based compensation awards vested. Excludes stock and unit options. + 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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- Definition Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash. + 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 (d)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested). + 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 (a)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: 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 + Details
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- Definition Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares. + 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 (d)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Net number of share options (or share units) granted during the 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)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding. + References Reference 1: 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 + Details
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- Definition Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + 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 (e)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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