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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
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