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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 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2013
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]
May 26, 2005
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, 2013
Stock Incentive Plan 2011 [Member]
Dec. 31, 2013
Employee Stock Incentive Plan [Member]
Dec. 31, 2012
Employee Stock Incentive Plan [Member]
Dec. 31, 2011
Employee Stock Incentive Plan [Member]
Dec. 31, 2013
Restricted Stock And Restricted Stock Units [Member]
Dec. 31, 2012
Restricted Stock And Restricted Stock Units [Member]
Dec. 31, 2011
Restricted Stock And Restricted Stock Units [Member]
Dec. 31, 2013
Stock Appreciation Rights (SARs) [Member]
Dec. 31, 2012
Stock Appreciation Rights (SARs) [Member]
Dec. 31, 2011
Stock Appreciation Rights (SARs) [Member]
Dec. 31, 2013
Equity Value Appreciation Awards [Member]
Dec. 31, 2011
Equity Value Appreciation Awards [Member]
Dec. 31, 2013
Time Based Awards [Member]
Restricted Stock And Restricted Stock Units [Member]
Dec. 31, 2013
Performance Shares [Member]
Restricted Stock And Restricted Stock Units [Member]
Share Capital [Line Items]                                                
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized           6,750,000 3,000,000 3,750,000   900,000 3,000,000                   1,917,000 2,119,500    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures       300,000         2,836,179                              
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period       150,000                                        
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, Fair Value                             $ 43,227 $ 22,557 $ 8,269              
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense                             17,219 5,242 7,280 12,682 296 387        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Outstanding, Weighted Average Remaining Contractual Terms                                             1 year 10 months 24 days 2 years 7 months 6 days
Restricted Stock And Restricted Unit Awards Fair Value                             35,113                  
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Share-based Awards Other than Options                             8,597                  
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in shares)                             428,772                  
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 Date Of Grant                 20.00%                              
Share Based Compensation Arrangement By Share Based Payment Award Vested Percentage On Each Of First Two Years                 20.00%                              
Additional Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period                 802,440                              
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value 2,191                                              
Proceeds from Stock Options Exercised 0 28 1,086                 0 27 1,011                    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value 0 5 900                                          
Share Based Compensation Arrangement By Share Based Payment Award Vested Options Weighted Average Remaining Contractual Term 2 years 9 months 18 days                                              
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term 2 years 9 months 18 days                                              
Share Based Compensation Arrangement By Share Based Payment Award Shares To Be Issued On Vested                                   0            
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Exercised In Period Value                                   80,323 301 2,289        
Share Based CompensationArrangement 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                                         2,923,509      
Share Based Compensation Arrangement By Share Based Payment Award Shares To Be Issued                                   1,434,554