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Shareholders Equity and Stock Options (Additional Information) (Details) (USD $)
 12 Months Ended 12 Months Ended
Dec. 31, 2012
offering_period
Dec. 31, 2011
Dec. 31, 2010
Sep. 30, 2012
Sep. 30, 2011
Dec. 31, 2012
Four Years [Member]
Dec. 31, 2012
Stock Options [Member]
Dec. 31, 2012
Stock Options [Member]
Maximum [Member]
Dec. 31, 2012
Stock Option [Member]
Dec. 31, 2011
Stock Option [Member]
Dec. 31, 2010
Stock Option [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]
Maximum [Member]
Dec. 31, 2011
Performance Shares [Member]
Maximum [Member]
Dec. 31, 2010
Performance Shares [Member]
Maximum [Member]
Dec. 31, 2009
Performance Shares [Member]
Maximum [Member]
Dec. 31, 2010
Performance Shares [Member]
Minimum [Member]
Dec. 31, 2012
Time Based Restricted Stock [Member]
Dec. 31, 2011
Time Based Restricted Stock [Member]
Dec. 31, 2012
Deferred Stock Units [Member]
Dec. 31, 2011
Deferred Stock Units [Member]
Dec. 31, 2010
Deferred Stock Units [Member]
Dec. 31, 2012
Employee Stock Purchase Plan [Member]
Dec. 31, 2010
Employee Stock Purchase Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                                    
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Lower Range Limit $ 0.5                                                  
Number Of Years 1 year 6 months     5 years   4 years           1 year 3 months 19 days               1 year 6 months            
Share Based Compensation Arrangement By Share Based Payment Award Expiry Period From Date Of Grant               10 years                                    
Time based restricted stock awards         $ 2                                          
Stock purchase right 1                                                  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Exercisable Options, Weighted Average Exercise Price $ 240.00                                                  
Class of Warrant or Right, Exercise Price of Warrants or Rights 0.01                                                  
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate 0.00% 0.00% 0.00%       0.00%                                      
Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Forfeitures             3.00%                                      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Total Intrinsic Value 8,900,000 4,100,000                                                
Employee Service Share-based Compensation, Cash Received from Exercise of Stock Options 17,000,000 11,100,000                                                
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Total Fair Value 2,000,000 3,600,000                                                
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized                 1,500,000     900,000               2,600,000            
Share-based Compensation $ 5,153,000 $ 8,096,000 $ 6,628,000           $ 2,000,000 $ 3,600,000 $ 4,000,000 $ 500,000 $ 1,700,000 $ 1,400,000           $ 1,600,000 $ 1,600,000 $ 700,000 $ 700,000 $ 700,000 $ 500,000 $ 500,000
Share Based Compensation Arrangement By Share Based Payment Award Performance Period                           3 years                        
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Target Award Percentage                             200.00% 100.00% 200.00% 67.00% 0.00%              
Share Based Compensation Arrangement By Sharebased Payment Award Percentage Of Actual Payment Of Target Amount                         97.40%                          
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period                                       3 years            
Share Based Compensation Arrangement By Share Based Payment Award Employee Stock Purchase Plan Number Of Offerings 2                                                  
Share Based Compensation Arrangement By Share Based Payment Award Employee Stock Purchase Plan Offering Period 6 months                                                  
Share-based Compensation Arrangement by Share-based Payment Award, Discount from Market Price, Purchase Date                                                 15.00%