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Share Capital (Details Textual) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended																						12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2011 Performance Shares [Member]	Dec. 31, 2010 Performance Shares [Member]	Dec. 31, 2011 Time Based Awards [Member]	Dec. 31, 2010 Time Based Awards [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 Restricted Stock and Restricted Stock Units [Member] Performance Shares [Member]	Dec. 31, 2012 Restricted Stock and Restricted Stock Units [Member] Time Based Awards [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 Equity Value Appreciation Awards [Member]	Dec. 31, 2011 Equity Value Appreciation Awards [Member]	Dec. 31, 2012 Stock Incentive Plan 2005 [Member]	Dec. 31, 2011 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]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized																	1,413,000			4,500,000	2,000,000	2,500,000		600,000	2,000,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures																		200,000					1,890,786
Additional Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period																							534,960
Number Outstanding, Forfeited				(1,423)	(4,944)	(41,454)	(3,345)											100,000
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, Total Fair Value								$ 22,557	$ 8,269	$ 14,976
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense								5,242	7,280	3,431			296	387	180
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Outstanding, Weighted Average Remaining Contractual Terms											1 year 9 months 18 days	1 year 6 months				1 year
Restricted Stock and Restricted Unit Awards Fair Value								10,322
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost 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 (in shares)								2,067,303
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, Options, Outstanding, Intrinsic Value	133
Proceeds from exercise of options	28	1,086	60																1,011
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Total Intrinsic Value	5	900	20
Number Outstanding, Weighted Average Contractual Life	3 years 9 months 18 days												1 year 2 months 12 days
Share Based Compensation Arrangement By Share Based Payment Award Vested Options 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 Shares To Be Issued On Vested													2,067,303
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Outstanding in Period, Intrinsic Value													$ 23,361
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Intrinsic Value													$ 23,361
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
Share Based Compensation Arrangement By Share Based Payment Award Shares To Be Issued													2,067,303

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Number of additional share options (or share units) granted during the period.

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The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the period.

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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).

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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.

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Net number of share options (or share units) granted during the period.

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